>> 1 /* -*- mode: asm -*-
>> 2 **
>> 3 ** head.S -- This file contains the initial boot code for the
>> 4 ** Linux/68k kernel.
>> 5 **
>> 6 ** Copyright 1993 by Hamish Macdonald
>> 7 **
>> 8 ** 68040 fixes by Michael Rausch
>> 9 ** 68060 fixes by Roman Hodek
>> 10 ** MMU cleanup by Randy Thelen
>> 11 ** Final MMU cleanup by Roman Zippel
>> 12 **
>> 13 ** Atari support by Andreas Schwab, using ideas of Robert de Vries
>> 14 ** and Bjoern Brauel
>> 15 ** VME Support by Richard Hirst
>> 16 **
>> 17 ** 94/11/14 Andreas Schwab: put kernel at PAGESIZE
>> 18 ** 94/11/18 Andreas Schwab: remove identity mapping of STRAM for Atari
>> 19 ** ++ Bjoern & Roman: ATARI-68040 support for the Medusa
>> 20 ** 95/11/18 Richard Hirst: Added MVME166 support
>> 21 ** 96/04/26 Guenther Kelleter: fixed identity mapping for Falcon with
>> 22 ** Magnum- and FX-alternate ram
>> 23 ** 98/04/25 Phil Blundell: added HP300 support
>> 24 ** 1998/08/30 David Kilzer: Added support for font_desc structures
>> 25 ** for linux-2.1.115
>> 26 ** 1999/02/11 Richard Zidlicky: added Q40 support (initial version 99/01/01)
>> 27 ** 2004/05/13 Kars de Jong: Finalised HP300 support
>> 28 **
>> 29 ** This file is subject to the terms and conditions of the GNU General Public
>> 30 ** License. See the file README.legal in the main directory of this archive
>> 31 ** for more details.
>> 32 **
>> 33 */
>> 34
1 /* 35 /*
2 * Copyright (C) 2009 Wind River Systems Inc !! 36 * Linux startup code.
3 * Implemented by fredrik.markstrom@gmail.co !! 37 *
4 * Copyright (C) 2004 Microtronix Datacom Ltd !! 38 * At this point, the boot loader has:
5 * Copyright (C) 2001 Vic Phillips, Microtroni !! 39 * Disabled interrupts
6 * !! 40 * Disabled caches
7 * Based on head.S for Altera's Excalibur deve !! 41 * Put us in supervisor state.
8 * !! 42 *
9 * Based on the following from the Excalibur s !! 43 * The kernel setup code takes the following steps:
10 * NA_MemoryMap.s, NR_JumpToStart.s, NR_S !! 44 * . Raise interrupt level
11 * !! 45 * . Set up initial kernel memory mapping.
12 * This file is subject to the terms and condi !! 46 * . This sets up a mapping of the 4M of memory the kernel is located in.
13 * License. See the file "COPYING" in the main !! 47 * . It also does a mapping of any initial machine specific areas.
14 * for more details. !! 48 * . Enable the MMU
>> 49 * . Enable cache memories
>> 50 * . Jump to kernel startup
>> 51 *
>> 52 * Much of the file restructuring was to accomplish:
>> 53 * 1) Remove register dependency through-out the file.
>> 54 * 2) Increase use of subroutines to perform functions
>> 55 * 3) Increase readability of the code
>> 56 *
>> 57 * Of course, readability is a subjective issue, so it will never be
>> 58 * argued that that goal was accomplished. It was merely a goal.
>> 59 * A key way to help make code more readable is to give good
>> 60 * documentation. So, the first thing you will find is exhaustive
>> 61 * write-ups on the structure of the file, and the features of the
>> 62 * functional subroutines.
>> 63 *
>> 64 * General Structure:
>> 65 * ------------------
>> 66 * Without a doubt the single largest chunk of head.S is spent
>> 67 * mapping the kernel and I/O physical space into the logical range
>> 68 * for the kernel.
>> 69 * There are new subroutines and data structures to make MMU
>> 70 * support cleaner and easier to understand.
>> 71 * First, you will find a routine call "mmu_map" which maps
>> 72 * a logical to a physical region for some length given a cache
>> 73 * type on behalf of the caller. This routine makes writing the
>> 74 * actual per-machine specific code very simple.
>> 75 * A central part of the code, but not a subroutine in itself,
>> 76 * is the mmu_init code which is broken down into mapping the kernel
>> 77 * (the same for all machines) and mapping machine-specific I/O
>> 78 * regions.
>> 79 * Also, there will be a description of engaging the MMU and
>> 80 * caches.
>> 81 * You will notice that there is a chunk of code which
>> 82 * can emit the entire MMU mapping of the machine. This is present
>> 83 * only in debug modes and can be very helpful.
>> 84 * Further, there is a new console driver in head.S that is
>> 85 * also only engaged in debug mode. Currently, it's only supported
>> 86 * on the Macintosh class of machines. However, it is hoped that
>> 87 * others will plug-in support for specific machines.
>> 88 *
>> 89 * ######################################################################
>> 90 *
>> 91 * mmu_map
>> 92 * -------
>> 93 * mmu_map was written for two key reasons. First, it was clear
>> 94 * that it was very difficult to read the previous code for mapping
>> 95 * regions of memory. Second, the Macintosh required such extensive
>> 96 * memory allocations that it didn't make sense to propagate the
>> 97 * existing code any further.
>> 98 * mmu_map requires some parameters:
>> 99 *
>> 100 * mmu_map (logical, physical, length, cache_type)
>> 101 *
>> 102 * While this essentially describes the function in the abstract, you'll
>> 103 * find more indepth description of other parameters at the implementation site.
>> 104 *
>> 105 * mmu_get_root_table_entry
>> 106 * ------------------------
>> 107 * mmu_get_ptr_table_entry
>> 108 * -----------------------
>> 109 * mmu_get_page_table_entry
>> 110 * ------------------------
>> 111 *
>> 112 * These routines are used by other mmu routines to get a pointer into
>> 113 * a table, if necessary a new table is allocated. These routines are working
>> 114 * basically like pmd_alloc() and pte_alloc() in <asm/pgtable.h>. The root
>> 115 * table needs of course only to be allocated once in mmu_get_root_table_entry,
>> 116 * so that here also some mmu specific initialization is done. The second page
>> 117 * at the start of the kernel (the first page is unmapped later) is used for
>> 118 * the kernel_pg_dir. It must be at a position known at link time (as it's used
>> 119 * to initialize the init task struct) and since it needs special cache
>> 120 * settings, it's the easiest to use this page, the rest of the page is used
>> 121 * for further pointer tables.
>> 122 * mmu_get_page_table_entry allocates always a whole page for page tables, this
>> 123 * means 1024 pages and so 4MB of memory can be mapped. It doesn't make sense
>> 124 * to manage page tables in smaller pieces as nearly all mappings have that
>> 125 * size.
>> 126 *
>> 127 * ######################################################################
>> 128 *
>> 129 *
>> 130 * ######################################################################
>> 131 *
>> 132 * mmu_engage
>> 133 * ----------
>> 134 * Thanks to a small helping routine enabling the mmu got quite simple
>> 135 * and there is only one way left. mmu_engage makes a complete a new mapping
>> 136 * that only includes the absolute necessary to be able to jump to the final
>> 137 * position and to restore the original mapping.
>> 138 * As this code doesn't need a transparent translation register anymore this
>> 139 * means all registers are free to be used by machines that needs them for
>> 140 * other purposes.
>> 141 *
>> 142 * ######################################################################
>> 143 *
>> 144 * mmu_print
>> 145 * ---------
>> 146 * This algorithm will print out the page tables of the system as
>> 147 * appropriate for an 030 or an 040. This is useful for debugging purposes
>> 148 * and as such is enclosed in #ifdef MMU_PRINT/#endif clauses.
>> 149 *
>> 150 * ######################################################################
>> 151 *
>> 152 * console_init
>> 153 * ------------
>> 154 * The console is also able to be turned off. The console in head.S
>> 155 * is specifically for debugging and can be very useful. It is surrounded by
>> 156 * #ifdef / #endif clauses so it doesn't have to ship in known-good
>> 157 * kernels. It's basic algorithm is to determine the size of the screen
>> 158 * (in height/width and bit depth) and then use that information for
>> 159 * displaying an 8x8 font or an 8x16 (widthxheight). I prefer the 8x8 for
>> 160 * debugging so I can see more good data. But it was trivial to add support
>> 161 * for both fonts, so I included it.
>> 162 * Also, the algorithm for plotting pixels is abstracted so that in
>> 163 * theory other platforms could add support for different kinds of frame
>> 164 * buffers. This could be very useful.
>> 165 *
>> 166 * console_put_penguin
>> 167 * -------------------
>> 168 * An important part of any Linux bring up is the penguin and there's
>> 169 * nothing like getting the Penguin on the screen! This algorithm will work
>> 170 * on any machine for which there is a console_plot_pixel.
>> 171 *
>> 172 * console_scroll
>> 173 * --------------
>> 174 * My hope is that the scroll algorithm does the right thing on the
>> 175 * various platforms, but it wouldn't be hard to add the test conditions
>> 176 * and new code if it doesn't.
>> 177 *
>> 178 * console_putc
>> 179 * -------------
>> 180 *
>> 181 * ######################################################################
>> 182 *
>> 183 * Register usage has greatly simplified within head.S. Every subroutine
>> 184 * saves and restores all registers that it modifies (except it returns a
>> 185 * value in there of course). So the only register that needs to be initialized
>> 186 * is the stack pointer.
>> 187 * All other init code and data is now placed in the init section, so it will
>> 188 * be automatically freed at the end of the kernel initialization.
>> 189 *
>> 190 * ######################################################################
>> 191 *
>> 192 * options
>> 193 * -------
>> 194 * There are many options available in a build of this file. I've
>> 195 * taken the time to describe them here to save you the time of searching
>> 196 * for them and trying to understand what they mean.
>> 197 *
>> 198 * CONFIG_xxx: These are the obvious machine configuration defines created
>> 199 * during configuration. These are defined in autoconf.h.
>> 200 *
>> 201 * CONSOLE_DEBUG: Only supports a Mac frame buffer but could easily be
>> 202 * extended to support other platforms.
>> 203 *
>> 204 * TEST_MMU: This is a test harness for running on any given machine but
>> 205 * getting an MMU dump for another class of machine. The classes of machines
>> 206 * that can be tested are any of the makes (Atari, Amiga, Mac, VME, etc.)
>> 207 * and any of the models (030, 040, 060, etc.).
>> 208 *
>> 209 * NOTE: TEST_MMU is NOT permanent! It is scheduled to be removed
>> 210 * When head.S boots on Atari, Amiga, Macintosh, and VME
>> 211 * machines. At that point the underlying logic will be
>> 212 * believed to be solid enough to be trusted, and TEST_MMU
>> 213 * can be dropped. Do note that that will clean up the
>> 214 * head.S code significantly as large blocks of #if/#else
>> 215 * clauses can be removed.
>> 216 *
>> 217 * MMU_NOCACHE_KERNEL: On the Macintosh platform there was an inquiry into
>> 218 * determing why devices don't appear to work. A test case was to remove
>> 219 * the cacheability of the kernel bits.
>> 220 *
>> 221 * MMU_PRINT: There is a routine built into head.S that can display the
>> 222 * MMU data structures. It outputs its result through the serial_putc
>> 223 * interface. So where ever that winds up driving data, that's where the
>> 224 * mmu struct will appear.
>> 225 *
>> 226 * SERIAL_DEBUG: There are a series of putc() macro statements
>> 227 * scattered through out the code to give progress of status to the
>> 228 * person sitting at the console. This constant determines whether those
>> 229 * are used.
>> 230 *
>> 231 * DEBUG: This is the standard DEBUG flag that can be set for building
>> 232 * the kernel. It has the effect adding additional tests into
>> 233 * the code.
>> 234 *
>> 235 * FONT_6x11:
>> 236 * FONT_8x8:
>> 237 * FONT_8x16:
>> 238 * In theory these could be determined at run time or handed
>> 239 * over by the booter. But, let's be real, it's a fine hard
>> 240 * coded value. (But, you will notice the code is run-time
>> 241 * flexible!) A pointer to the font's struct font_desc
>> 242 * is kept locally in Lconsole_font. It is used to determine
>> 243 * font size information dynamically.
>> 244 *
>> 245 * Atari constants:
>> 246 * USE_PRINTER: Use the printer port for serial debug.
>> 247 * USE_SCC_B: Use the SCC port A (Serial2) for serial debug.
>> 248 * USE_SCC_A: Use the SCC port B (Modem2) for serial debug.
>> 249 * USE_MFP: Use the ST-MFP port (Modem1) for serial debug.
>> 250 *
>> 251 * Macintosh constants:
>> 252 * MAC_USE_SCC_A: Use SCC port A (modem) for serial debug.
>> 253 * MAC_USE_SCC_B: Use SCC port B (printer) for serial debug.
15 */ 254 */
16 255
17 #include <linux/init.h> <<
18 #include <linux/linkage.h> 256 #include <linux/linkage.h>
19 #include <asm/thread_info.h> !! 257 #include <linux/init.h>
20 #include <asm/processor.h> !! 258 #include <linux/pgtable.h>
21 #include <asm/cache.h> !! 259 #include <asm/bootinfo.h>
>> 260 #include <asm/bootinfo-amiga.h>
>> 261 #include <asm/bootinfo-atari.h>
>> 262 #include <asm/bootinfo-hp300.h>
>> 263 #include <asm/bootinfo-mac.h>
>> 264 #include <asm/bootinfo-q40.h>
>> 265 #include <asm/bootinfo-virt.h>
>> 266 #include <asm/bootinfo-vme.h>
>> 267 #include <asm/setup.h>
>> 268 #include <asm/entry.h>
22 #include <asm/page.h> 269 #include <asm/page.h>
23 #include <asm/asm-offsets.h> 270 #include <asm/asm-offsets.h>
24 #include <asm/asm-macros.h> !! 271 #ifdef CONFIG_MAC
>> 272 # include <asm/machw.h>
>> 273 #endif
>> 274
>> 275 #ifdef CONFIG_EARLY_PRINTK
>> 276 # define SERIAL_DEBUG
>> 277 # if defined(CONFIG_MAC) && defined(CONFIG_FONT_SUPPORT)
>> 278 # define CONSOLE_DEBUG
>> 279 # endif
>> 280 #endif
>> 281
>> 282 #undef MMU_PRINT
>> 283 #undef MMU_NOCACHE_KERNEL
>> 284 #undef DEBUG
25 285
26 /* 286 /*
27 * ZERO_PAGE is a special page that is used fo !! 287 * For the head.S console, there are three supported fonts, 6x11, 8x16 and 8x8.
28 * data and COW. !! 288 * The 8x8 font is harder to read but fits more on the screen.
>> 289 */
>> 290 #define FONT_8x8 /* default */
>> 291 /* #define FONT_8x16 */ /* 2nd choice */
>> 292 /* #define FONT_6x11 */ /* 3rd choice */
>> 293
>> 294 .globl kernel_pg_dir
>> 295 .globl availmem
>> 296 .globl m68k_init_mapped_size
>> 297 .globl m68k_pgtable_cachemode
>> 298 .globl m68k_supervisor_cachemode
>> 299 #ifdef CONFIG_MVME16x
>> 300 .globl mvme_bdid
>> 301 #endif
>> 302 #ifdef CONFIG_Q40
>> 303 .globl q40_mem_cptr
>> 304 #endif
>> 305
>> 306 CPUTYPE_040 = 1 /* indicates an 040 */
>> 307 CPUTYPE_060 = 2 /* indicates an 060 */
>> 308 CPUTYPE_0460 = 3 /* if either above are set, this is set */
>> 309 CPUTYPE_020 = 4 /* indicates an 020 */
>> 310
>> 311 /* Translation control register */
>> 312 TC_ENABLE = 0x8000
>> 313 TC_PAGE8K = 0x4000
>> 314 TC_PAGE4K = 0x0000
>> 315
>> 316 /* Transparent translation registers */
>> 317 TTR_ENABLE = 0x8000 /* enable transparent translation */
>> 318 TTR_ANYMODE = 0x4000 /* user and kernel mode access */
>> 319 TTR_KERNELMODE = 0x2000 /* only kernel mode access */
>> 320 TTR_USERMODE = 0x0000 /* only user mode access */
>> 321 TTR_CI = 0x0400 /* inhibit cache */
>> 322 TTR_RW = 0x0200 /* read/write mode */
>> 323 TTR_RWM = 0x0100 /* read/write mask */
>> 324 TTR_FCB2 = 0x0040 /* function code base bit 2 */
>> 325 TTR_FCB1 = 0x0020 /* function code base bit 1 */
>> 326 TTR_FCB0 = 0x0010 /* function code base bit 0 */
>> 327 TTR_FCM2 = 0x0004 /* function code mask bit 2 */
>> 328 TTR_FCM1 = 0x0002 /* function code mask bit 1 */
>> 329 TTR_FCM0 = 0x0001 /* function code mask bit 0 */
>> 330
>> 331 /* Cache Control registers */
>> 332 CC6_ENABLE_D = 0x80000000 /* enable data cache (680[46]0) */
>> 333 CC6_FREEZE_D = 0x40000000 /* freeze data cache (68060) */
>> 334 CC6_ENABLE_SB = 0x20000000 /* enable store buffer (68060) */
>> 335 CC6_PUSH_DPI = 0x10000000 /* disable CPUSH invalidation (68060) */
>> 336 CC6_HALF_D = 0x08000000 /* half-cache mode for data cache (68060) */
>> 337 CC6_ENABLE_B = 0x00800000 /* enable branch cache (68060) */
>> 338 CC6_CLRA_B = 0x00400000 /* clear all entries in branch cache (68060) */
>> 339 CC6_CLRU_B = 0x00200000 /* clear user entries in branch cache (68060) */
>> 340 CC6_ENABLE_I = 0x00008000 /* enable instruction cache (680[46]0) */
>> 341 CC6_FREEZE_I = 0x00004000 /* freeze instruction cache (68060) */
>> 342 CC6_HALF_I = 0x00002000 /* half-cache mode for instruction cache (68060) */
>> 343 CC3_ALLOC_WRITE = 0x00002000 /* write allocate mode(68030) */
>> 344 CC3_ENABLE_DB = 0x00001000 /* enable data burst (68030) */
>> 345 CC3_CLR_D = 0x00000800 /* clear data cache (68030) */
>> 346 CC3_CLRE_D = 0x00000400 /* clear entry in data cache (68030) */
>> 347 CC3_FREEZE_D = 0x00000200 /* freeze data cache (68030) */
>> 348 CC3_ENABLE_D = 0x00000100 /* enable data cache (68030) */
>> 349 CC3_ENABLE_IB = 0x00000010 /* enable instruction burst (68030) */
>> 350 CC3_CLR_I = 0x00000008 /* clear instruction cache (68030) */
>> 351 CC3_CLRE_I = 0x00000004 /* clear entry in instruction cache (68030) */
>> 352 CC3_FREEZE_I = 0x00000002 /* freeze instruction cache (68030) */
>> 353 CC3_ENABLE_I = 0x00000001 /* enable instruction cache (68030) */
>> 354
>> 355 /* Miscellaneous definitions */
>> 356 PAGESIZE = 4096
>> 357 PAGESHIFT = 12
>> 358
>> 359 ROOT_TABLE_SIZE = 128
>> 360 PTR_TABLE_SIZE = 128
>> 361 PAGE_TABLE_SIZE = 64
>> 362 ROOT_INDEX_SHIFT = 25
>> 363 PTR_INDEX_SHIFT = 18
>> 364 PAGE_INDEX_SHIFT = 12
>> 365
>> 366 #ifdef DEBUG
>> 367 /* When debugging use readable names for labels */
>> 368 #ifdef __STDC__
>> 369 #define L(name) .head.S.##name
>> 370 #else
>> 371 #define L(name) .head.S./**/name
>> 372 #endif
>> 373 #else
>> 374 #ifdef __STDC__
>> 375 #define L(name) .L##name
>> 376 #else
>> 377 #define L(name) .L/**/name
>> 378 #endif
>> 379 #endif
>> 380
>> 381 /* The __INITDATA stuff is a no-op when ftrace or kgdb are turned on */
>> 382 #ifndef __INITDATA
>> 383 #define __INITDATA .data
>> 384 #define __FINIT .previous
>> 385 #endif
>> 386
>> 387 /* Several macros to make the writing of subroutines easier:
>> 388 * - func_start marks the beginning of the routine which setups the frame
>> 389 * register and saves the registers, it also defines another macro
>> 390 * to automatically restore the registers again.
>> 391 * - func_return marks the end of the routine and simply calls the prepared
>> 392 * macro to restore registers and jump back to the caller.
>> 393 * - func_define generates another macro to automatically put arguments
>> 394 * onto the stack call the subroutine and cleanup the stack again.
>> 395 */
>> 396
>> 397 /* Within subroutines these macros can be used to access the arguments
>> 398 * on the stack. With STACK some allocated memory on the stack can be
>> 399 * accessed and ARG0 points to the return address (used by mmu_engage).
29 */ 400 */
30 .data !! 401 #define STACK %a6@(stackstart)
31 .global empty_zero_page !! 402 #define ARG0 %a6@(4)
32 .align 12 !! 403 #define ARG1 %a6@(8)
33 empty_zero_page: !! 404 #define ARG2 %a6@(12)
34 .space PAGE_SIZE !! 405 #define ARG3 %a6@(16)
>> 406 #define ARG4 %a6@(20)
>> 407
>> 408 .macro func_start name,saveregs,stack=0
>> 409 L(\name):
>> 410 linkw %a6,#-\stack
>> 411 moveml \saveregs,%sp@-
>> 412 .set stackstart,-\stack
>> 413
>> 414 .macro func_return_\name
>> 415 moveml %sp@+,\saveregs
>> 416 unlk %a6
>> 417 rts
>> 418 .endm
>> 419 .endm
>> 420
>> 421 .macro func_return name
>> 422 func_return_\name
>> 423 .endm
>> 424
>> 425 .macro func_call name
>> 426 jbsr L(\name)
>> 427 .endm
>> 428
>> 429 .macro move_stack nr,arg1,arg2,arg3,arg4
>> 430 .if \nr
>> 431 move_stack "(\nr-1)",\arg2,\arg3,\arg4
>> 432 movel \arg1,%sp@-
>> 433 .endif
>> 434 .endm
>> 435
>> 436 .macro func_define name,nr=0
>> 437 .macro \name arg1,arg2,arg3,arg4
>> 438 move_stack \nr,\arg1,\arg2,\arg3,\arg4
>> 439 func_call \name
>> 440 .if \nr
>> 441 lea %sp@(\nr*4),%sp
>> 442 .endif
>> 443 .endm
>> 444 .endm
>> 445
>> 446 func_define mmu_map,4
>> 447 func_define mmu_map_tt,4
>> 448 func_define mmu_fixup_page_mmu_cache,1
>> 449 func_define mmu_temp_map,2
>> 450 func_define mmu_engage
>> 451 func_define mmu_get_root_table_entry,1
>> 452 func_define mmu_get_ptr_table_entry,2
>> 453 func_define mmu_get_page_table_entry,2
>> 454 func_define mmu_print
>> 455 func_define get_new_page
>> 456 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 457 func_define set_leds
>> 458 #endif
>> 459
>> 460 .macro mmu_map_eq arg1,arg2,arg3
>> 461 mmu_map \arg1,\arg1,\arg2,\arg3
>> 462 .endm
>> 463
>> 464 .macro get_bi_record record
>> 465 pea \record
>> 466 func_call get_bi_record
>> 467 addql #4,%sp
>> 468 .endm
>> 469
>> 470 func_define serial_putc,1
>> 471 func_define console_putc,1
>> 472
>> 473 func_define console_init
>> 474 func_define console_put_penguin
>> 475 func_define console_plot_pixel,3
>> 476 func_define console_scroll
>> 477
>> 478 .macro putc ch
>> 479 #if defined(CONSOLE_DEBUG) || defined(SERIAL_DEBUG)
>> 480 pea \ch
>> 481 #endif
>> 482 #ifdef CONSOLE_DEBUG
>> 483 func_call console_putc
>> 484 #endif
>> 485 #ifdef SERIAL_DEBUG
>> 486 func_call serial_putc
>> 487 #endif
>> 488 #if defined(CONSOLE_DEBUG) || defined(SERIAL_DEBUG)
>> 489 addql #4,%sp
>> 490 #endif
>> 491 .endm
>> 492
>> 493 .macro dputc ch
>> 494 #ifdef DEBUG
>> 495 putc \ch
>> 496 #endif
>> 497 .endm
>> 498
>> 499 func_define putn,1
>> 500
>> 501 .macro dputn nr
>> 502 #ifdef DEBUG
>> 503 putn \nr
>> 504 #endif
>> 505 .endm
>> 506
>> 507 .macro puts string
>> 508 #if defined(CONSOLE_DEBUG) || defined(SERIAL_DEBUG)
>> 509 __INITDATA
>> 510 .Lstr\@:
>> 511 .string "\string"
>> 512 __FINIT
>> 513 pea %pc@(.Lstr\@)
>> 514 func_call puts
>> 515 addql #4,%sp
>> 516 #endif
>> 517 .endm
>> 518
>> 519 .macro dputs string
>> 520 #ifdef DEBUG
>> 521 puts "\string"
>> 522 #endif
>> 523 .endm
>> 524
>> 525 #define is_not_amiga(lab) cmpl &MACH_AMIGA,%pc@(m68k_machtype); jne lab
>> 526 #define is_not_atari(lab) cmpl &MACH_ATARI,%pc@(m68k_machtype); jne lab
>> 527 #define is_not_mac(lab) cmpl &MACH_MAC,%pc@(m68k_machtype); jne lab
>> 528 #define is_not_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jne lab
>> 529 #define is_not_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jne lab
>> 530 #define is_not_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jne lab
>> 531 #define is_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jeq lab
>> 532 #define is_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jeq lab
>> 533 #define is_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jeq lab
>> 534 #define is_not_hp300(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); jne lab
>> 535 #define is_not_apollo(lab) cmpl &MACH_APOLLO,%pc@(m68k_machtype); jne lab
>> 536 #define is_not_q40(lab) cmpl &MACH_Q40,%pc@(m68k_machtype); jne lab
>> 537 #define is_not_sun3x(lab) cmpl &MACH_SUN3X,%pc@(m68k_machtype); jne lab
>> 538 #define is_not_virt(lab) cmpl &MACH_VIRT,%pc@(m68k_machtype); jne lab
>> 539
>> 540 #define hasnt_leds(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); \
>> 541 jeq 42f; \
>> 542 cmpl &MACH_APOLLO,%pc@(m68k_machtype); \
>> 543 jne lab ;\
>> 544 42:\
>> 545
>> 546 #define is_040_or_060(lab) btst &CPUTYPE_0460,%pc@(L(cputype)+3); jne lab
>> 547 #define is_not_040_or_060(lab) btst &CPUTYPE_0460,%pc@(L(cputype)+3); jeq lab
>> 548 #define is_040(lab) btst &CPUTYPE_040,%pc@(L(cputype)+3); jne lab
>> 549 #define is_060(lab) btst &CPUTYPE_060,%pc@(L(cputype)+3); jne lab
>> 550 #define is_not_060(lab) btst &CPUTYPE_060,%pc@(L(cputype)+3); jeq lab
>> 551 #define is_020(lab) btst &CPUTYPE_020,%pc@(L(cputype)+3); jne lab
>> 552 #define is_not_020(lab) btst &CPUTYPE_020,%pc@(L(cputype)+3); jeq lab
>> 553
>> 554 /* On the HP300 we use the on-board LEDs for debug output before
>> 555 the console is running. Writing a 1 bit turns the corresponding LED
>> 556 _off_ - on the 340 bit 7 is towards the back panel of the machine. */
>> 557 .macro leds mask
>> 558 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 559 hasnt_leds(.Lled\@)
>> 560 pea \mask
>> 561 func_call set_leds
>> 562 addql #4,%sp
>> 563 .Lled\@:
>> 564 #endif
>> 565 .endm
35 566
>> 567 __HEAD
>> 568 ENTRY(_stext)
36 /* 569 /*
37 * This global variable is used as an extensio !! 570 * Version numbers of the bootinfo interface
38 * STATUS register to emulate a user/superviso !! 571 * The area from _stext to _start will later be used as kernel pointer table
39 */ 572 */
40 .data !! 573 bras 1f /* Jump over bootinfo version numbers */
41 .align 2 <<
42 .set noat <<
43 574
44 .global _current_thread !! 575 .long BOOTINFOV_MAGIC
45 _current_thread: !! 576 .long MACH_AMIGA, AMIGA_BOOTI_VERSION
>> 577 .long MACH_ATARI, ATARI_BOOTI_VERSION
>> 578 .long MACH_MVME147, MVME147_BOOTI_VERSION
>> 579 .long MACH_MVME16x, MVME16x_BOOTI_VERSION
>> 580 .long MACH_BVME6000, BVME6000_BOOTI_VERSION
>> 581 .long MACH_MAC, MAC_BOOTI_VERSION
>> 582 .long MACH_Q40, Q40_BOOTI_VERSION
>> 583 .long MACH_HP300, HP300_BOOTI_VERSION
46 .long 0 584 .long 0
>> 585 1: jra __start
>> 586
>> 587 .equ kernel_pg_dir,_stext
>> 588
>> 589 .equ .,_stext+PAGESIZE
>> 590
>> 591 ENTRY(_start)
>> 592 jra __start
>> 593 __INIT
>> 594 ENTRY(__start)
47 /* 595 /*
48 * Input(s): passed from u-boot !! 596 * Setup initial stack pointer
49 * r4 - Optional pointer to a board informat <<
50 * r5 - Optional pointer to the physical sta <<
51 * disk. <<
52 * r6 - Optional pointer to the physical end <<
53 * disk. <<
54 * r7 - Optional pointer to the physical sta <<
55 * command-line parameters. <<
56 */ 597 */
>> 598 lea %pc@(_stext),%sp
57 599
58 /* 600 /*
59 * First executable code - detected and jumped !! 601 * Record the CPU and machine type.
60 * if the code resides in flash (looks for "Ni <<
61 * the potential executable image). <<
62 */ 602 */
63 __HEAD !! 603 get_bi_record BI_MACHTYPE
64 ENTRY(_start) !! 604 lea %pc@(m68k_machtype),%a1
65 wrctl status, r0 /* Dis !! 605 movel %a0@,%a1@
>> 606
>> 607 get_bi_record BI_FPUTYPE
>> 608 lea %pc@(m68k_fputype),%a1
>> 609 movel %a0@,%a1@
>> 610
>> 611 get_bi_record BI_MMUTYPE
>> 612 lea %pc@(m68k_mmutype),%a1
>> 613 movel %a0@,%a1@
>> 614
>> 615 get_bi_record BI_CPUTYPE
>> 616 lea %pc@(m68k_cputype),%a1
>> 617 movel %a0@,%a1@
>> 618
>> 619 leds 0x1
>> 620
>> 621 #ifdef CONFIG_MAC
>> 622 /*
>> 623 * For Macintosh, we need to determine the display parameters early (at least
>> 624 * while debugging it).
>> 625 */
>> 626
>> 627 is_not_mac(L(test_notmac))
>> 628
>> 629 get_bi_record BI_MAC_VADDR
>> 630 lea %pc@(L(mac_videobase)),%a1
>> 631 movel %a0@,%a1@
>> 632
>> 633 get_bi_record BI_MAC_VDEPTH
>> 634 lea %pc@(L(mac_videodepth)),%a1
>> 635 movel %a0@,%a1@
>> 636
>> 637 get_bi_record BI_MAC_VDIM
>> 638 lea %pc@(L(mac_dimensions)),%a1
>> 639 movel %a0@,%a1@
>> 640
>> 641 get_bi_record BI_MAC_VROW
>> 642 lea %pc@(L(mac_rowbytes)),%a1
>> 643 movel %a0@,%a1@
>> 644
>> 645 get_bi_record BI_MAC_SCCBASE
>> 646 lea %pc@(L(mac_sccbase)),%a1
>> 647 movel %a0@,%a1@
>> 648
>> 649 L(test_notmac):
>> 650 #endif /* CONFIG_MAC */
>> 651
>> 652 #ifdef CONFIG_VIRT
>> 653 is_not_virt(L(test_notvirt))
>> 654
>> 655 get_bi_record BI_VIRT_GF_TTY_BASE
>> 656 lea %pc@(L(virt_gf_tty_base)),%a1
>> 657 movel %a0@,%a1@
>> 658 L(test_notvirt):
>> 659 #endif /* CONFIG_VIRT */
>> 660
>> 661 /*
>> 662 * There are ultimately two pieces of information we want for all kinds of
>> 663 * processors CpuType and CacheBits. The CPUTYPE was passed in from booter
>> 664 * and is converted here from a booter type definition to a separate bit
>> 665 * number which allows for the standard is_0x0 macro tests.
>> 666 */
>> 667 movel %pc@(m68k_cputype),%d0
>> 668 /*
>> 669 * Assume it's an 030
>> 670 */
>> 671 clrl %d1
>> 672
>> 673 /*
>> 674 * Test the BootInfo cputype for 060
>> 675 */
>> 676 btst #CPUB_68060,%d0
>> 677 jeq 1f
>> 678 bset #CPUTYPE_060,%d1
>> 679 bset #CPUTYPE_0460,%d1
>> 680 jra 3f
>> 681 1:
>> 682 /*
>> 683 * Test the BootInfo cputype for 040
>> 684 */
>> 685 btst #CPUB_68040,%d0
>> 686 jeq 2f
>> 687 bset #CPUTYPE_040,%d1
>> 688 bset #CPUTYPE_0460,%d1
>> 689 jra 3f
>> 690 2:
>> 691 /*
>> 692 * Test the BootInfo cputype for 020
>> 693 */
>> 694 btst #CPUB_68020,%d0
>> 695 jeq 3f
>> 696 bset #CPUTYPE_020,%d1
>> 697 jra 3f
>> 698 3:
>> 699 /*
>> 700 * Record the cpu type
>> 701 */
>> 702 lea %pc@(L(cputype)),%a0
>> 703 movel %d1,%a0@
>> 704
>> 705 /*
>> 706 * NOTE:
>> 707 *
>> 708 * Now the macros are valid:
>> 709 * is_040_or_060
>> 710 * is_not_040_or_060
>> 711 * is_040
>> 712 * is_060
>> 713 * is_not_060
>> 714 */
>> 715
>> 716 /*
>> 717 * Determine the cache mode for pages holding MMU tables
>> 718 * and for supervisor mode, unused for '020 and '030
>> 719 */
>> 720 clrl %d0
>> 721 clrl %d1
>> 722
>> 723 is_not_040_or_060(L(save_cachetype))
>> 724
>> 725 /*
>> 726 * '040 or '060
>> 727 * d1 := cacheable write-through
>> 728 * NOTE: The 68040 manual strongly recommends non-cached for MMU tables,
>> 729 * but we have been using write-through since at least 2.0.29 so I
>> 730 * guess it is OK.
>> 731 */
>> 732 #ifdef CONFIG_060_WRITETHROUGH
>> 733 /*
>> 734 * If this is a 68060 board using drivers with cache coherency
>> 735 * problems, then supervisor memory accesses need to be write-through
>> 736 * also; otherwise, we want copyback.
>> 737 */
>> 738
>> 739 is_not_060(1f)
>> 740 movel #_PAGE_CACHE040W,%d0
>> 741 jra L(save_cachetype)
>> 742 #endif /* CONFIG_060_WRITETHROUGH */
>> 743 1:
>> 744 movew #_PAGE_CACHE040,%d0
>> 745
>> 746 movel #_PAGE_CACHE040W,%d1
>> 747
>> 748 L(save_cachetype):
>> 749 /* Save cache mode for supervisor mode and page tables
>> 750 */
>> 751 lea %pc@(m68k_supervisor_cachemode),%a0
>> 752 movel %d0,%a0@
>> 753 lea %pc@(m68k_pgtable_cachemode),%a0
>> 754 movel %d1,%a0@
>> 755
>> 756 /*
>> 757 * raise interrupt level
>> 758 */
>> 759 movew #0x2700,%sr
>> 760
>> 761 /*
>> 762 If running on an Atari, determine the I/O base of the
>> 763 serial port and test if we are running on a Medusa or Hades.
>> 764 This test is necessary here, because on the Hades the serial
>> 765 port is only accessible in the high I/O memory area.
>> 766
>> 767 The test whether it is a Medusa is done by writing to the byte at
>> 768 phys. 0x0. This should result in a bus error on all other machines.
>> 769
>> 770 ...should, but doesn't. The Afterburner040 for the Falcon has the
>> 771 same behaviour (0x0..0x7 are no ROM shadow). So we have to do
>> 772 another test to distinguish Medusa and AB040. This is a
>> 773 read attempt for 0x00ff82fe phys. that should bus error on a Falcon
>> 774 (+AB040), but is in the range where the Medusa always asserts DTACK.
>> 775
>> 776 The test for the Hades is done by reading address 0xb0000000. This
>> 777 should give a bus error on the Medusa.
>> 778 */
>> 779
>> 780 #ifdef CONFIG_ATARI
>> 781 is_not_atari(L(notypetest))
>> 782
>> 783 /* get special machine type (Medusa/Hades/AB40) */
>> 784 moveq #0,%d3 /* default if tag doesn't exist */
>> 785 get_bi_record BI_ATARI_MCH_TYPE
>> 786 tstl %d0
>> 787 jbmi 1f
>> 788 movel %a0@,%d3
>> 789 lea %pc@(atari_mch_type),%a0
>> 790 movel %d3,%a0@
>> 791 1:
>> 792 /* On the Hades, the iobase must be set up before opening the
>> 793 * serial port. There are no I/O regs at 0x00ffxxxx at all. */
>> 794 moveq #0,%d0
>> 795 cmpl #ATARI_MACH_HADES,%d3
>> 796 jbne 1f
>> 797 movel #0xff000000,%d0 /* Hades I/O base addr: 0xff000000 */
>> 798 1: lea %pc@(L(iobase)),%a0
>> 799 movel %d0,%a0@
>> 800
>> 801 L(notypetest):
>> 802 #endif
>> 803
>> 804 #ifdef CONFIG_VME
>> 805 is_mvme147(L(getvmetype))
>> 806 is_bvme6000(L(getvmetype))
>> 807 is_not_mvme16x(L(gvtdone))
>> 808
>> 809 /* See if the loader has specified the BI_VME_TYPE tag. Recent
>> 810 * versions of VMELILO and TFTPLILO do this. We have to do this
>> 811 * early so we know how to handle console output. If the tag
>> 812 * doesn't exist then we use the Bug for output on MVME16x.
>> 813 */
>> 814 L(getvmetype):
>> 815 get_bi_record BI_VME_TYPE
>> 816 tstl %d0
>> 817 jbmi 1f
>> 818 movel %a0@,%d3
>> 819 lea %pc@(vme_brdtype),%a0
>> 820 movel %d3,%a0@
>> 821 1:
>> 822 #ifdef CONFIG_MVME16x
>> 823 is_not_mvme16x(L(gvtdone))
>> 824
>> 825 /* Need to get the BRD_ID info to differentiate between 162, 167,
>> 826 * etc. This is available as a BI_VME_BRDINFO tag with later
>> 827 * versions of VMELILO and TFTPLILO, otherwise we call the Bug.
>> 828 */
>> 829 get_bi_record BI_VME_BRDINFO
>> 830 tstl %d0
>> 831 jpl 1f
>> 832
>> 833 /* Get pointer to board ID data from Bug */
>> 834 movel %d2,%sp@-
>> 835 trap #15
>> 836 .word 0x70 /* trap 0x70 - .BRD_ID */
>> 837 movel %sp@+,%a0
>> 838 1:
>> 839 lea %pc@(mvme_bdid),%a1
>> 840 /* Structure is 32 bytes long */
>> 841 movel %a0@+,%a1@+
>> 842 movel %a0@+,%a1@+
>> 843 movel %a0@+,%a1@+
>> 844 movel %a0@+,%a1@+
>> 845 movel %a0@+,%a1@+
>> 846 movel %a0@+,%a1@+
>> 847 movel %a0@+,%a1@+
>> 848 movel %a0@+,%a1@+
>> 849 #endif
>> 850
>> 851 L(gvtdone):
>> 852
>> 853 #endif
>> 854
>> 855 #ifdef CONFIG_HP300
>> 856 is_not_hp300(L(nothp))
>> 857
>> 858 /* Get the address of the UART for serial debugging */
>> 859 get_bi_record BI_HP300_UART_ADDR
>> 860 tstl %d0
>> 861 jbmi 1f
>> 862 movel %a0@,%d3
>> 863 lea %pc@(L(uartbase)),%a0
>> 864 movel %d3,%a0@
>> 865 get_bi_record BI_HP300_UART_SCODE
>> 866 tstl %d0
>> 867 jbmi 1f
>> 868 movel %a0@,%d3
>> 869 lea %pc@(L(uart_scode)),%a0
>> 870 movel %d3,%a0@
>> 871 1:
>> 872 L(nothp):
>> 873 #endif
>> 874
>> 875 /*
>> 876 * Initialize serial port
>> 877 */
>> 878 jbsr L(serial_init)
>> 879
>> 880 /*
>> 881 * Initialize console
>> 882 */
>> 883 #ifdef CONFIG_MAC
>> 884 is_not_mac(L(nocon))
>> 885 # ifdef CONSOLE_DEBUG
>> 886 console_init
>> 887 # ifdef CONFIG_LOGO
>> 888 console_put_penguin
>> 889 # endif /* CONFIG_LOGO */
>> 890 # endif /* CONSOLE_DEBUG */
>> 891 L(nocon):
>> 892 #endif /* CONFIG_MAC */
>> 893
>> 894
>> 895 putc '\n'
>> 896 putc 'A'
>> 897 leds 0x2
>> 898 dputn %pc@(L(cputype))
>> 899 dputn %pc@(m68k_supervisor_cachemode)
>> 900 dputn %pc@(m68k_pgtable_cachemode)
>> 901 dputc '\n'
>> 902
>> 903 /*
>> 904 * Save physical start address of kernel
>> 905 */
>> 906 lea %pc@(L(phys_kernel_start)),%a0
>> 907 lea %pc@(_stext),%a1
>> 908 subl #_stext,%a1
>> 909 addl #PAGE_OFFSET,%a1
>> 910 movel %a1,%a0@
>> 911
>> 912 putc 'B'
>> 913
>> 914 leds 0x4
>> 915
>> 916 /*
>> 917 * mmu_init
>> 918 *
>> 919 * This block of code does what's necessary to map in the various kinds
>> 920 * of machines for execution of Linux.
>> 921 * First map the first 4, 8, or 16 MB of kernel code & data
>> 922 */
>> 923
>> 924 get_bi_record BI_MEMCHUNK
>> 925 movel %a0@(4),%d0
>> 926 movel #16*1024*1024,%d1
>> 927 cmpl %d0,%d1
>> 928 jls 1f
>> 929 lsrl #1,%d1
>> 930 cmpl %d0,%d1
>> 931 jls 1f
>> 932 lsrl #1,%d1
>> 933 1:
>> 934 lea %pc@(m68k_init_mapped_size),%a0
>> 935 movel %d1,%a0@
>> 936 mmu_map #PAGE_OFFSET,%pc@(L(phys_kernel_start)),%d1,\
>> 937 %pc@(m68k_supervisor_cachemode)
>> 938
>> 939 putc 'C'
>> 940
>> 941 #ifdef CONFIG_AMIGA
>> 942
>> 943 L(mmu_init_amiga):
>> 944
>> 945 is_not_amiga(L(mmu_init_not_amiga))
>> 946 /*
>> 947 * mmu_init_amiga
>> 948 */
>> 949
>> 950 putc 'D'
>> 951
>> 952 is_not_040_or_060(1f)
>> 953
>> 954 /*
>> 955 * 040: Map the 16Meg range physical 0x0 up to logical 0x8000.0000
>> 956 */
>> 957 mmu_map #0x80000000,#0,#0x01000000,#_PAGE_NOCACHE_S
>> 958 /*
>> 959 * Map the Zorro III I/O space with transparent translation
>> 960 * for frame buffer memory etc.
>> 961 */
>> 962 mmu_map_tt #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE_S
>> 963
>> 964 jbra L(mmu_init_done)
>> 965
>> 966 1:
>> 967 /*
>> 968 * 030: Map the 32Meg range physical 0x0 up to logical 0x8000.0000
>> 969 */
>> 970 mmu_map #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 971 mmu_map_tt #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE030
>> 972
>> 973 jbra L(mmu_init_done)
>> 974
>> 975 L(mmu_init_not_amiga):
>> 976 #endif
>> 977
>> 978 #ifdef CONFIG_ATARI
>> 979
>> 980 L(mmu_init_atari):
>> 981
>> 982 is_not_atari(L(mmu_init_not_atari))
>> 983
>> 984 putc 'E'
>> 985
>> 986 /* On the Atari, we map the I/O region (phys. 0x00ffxxxx) by mapping
>> 987 the last 16 MB of virtual address space to the first 16 MB (i.e.
>> 988 0xffxxxxxx -> 0x00xxxxxx). For this, an additional pointer table is
>> 989 needed. I/O ranges are marked non-cachable.
>> 990
>> 991 For the Medusa it is better to map the I/O region transparently
>> 992 (i.e. 0xffxxxxxx -> 0xffxxxxxx), because some I/O registers are
>> 993 accessible only in the high area.
>> 994
>> 995 On the Hades all I/O registers are only accessible in the high
>> 996 area.
>> 997 */
>> 998
>> 999 /* I/O base addr for non-Medusa, non-Hades: 0x00000000 */
>> 1000 moveq #0,%d0
>> 1001 movel %pc@(atari_mch_type),%d3
>> 1002 cmpl #ATARI_MACH_MEDUSA,%d3
>> 1003 jbeq 2f
>> 1004 cmpl #ATARI_MACH_HADES,%d3
>> 1005 jbne 1f
>> 1006 2: movel #0xff000000,%d0 /* Medusa/Hades base addr: 0xff000000 */
>> 1007 1: movel %d0,%d3
>> 1008
>> 1009 is_040_or_060(L(spata68040))
>> 1010
>> 1011 /* Map everything non-cacheable, though not all parts really
>> 1012 * need to disable caches (crucial only for 0xff8000..0xffffff
>> 1013 * (standard I/O) and 0xf00000..0xf3ffff (IDE)). The remainder
>> 1014 * isn't really used, except for sometimes peeking into the
>> 1015 * ROMs (mirror at phys. 0x0), so caching isn't necessary for
>> 1016 * this. */
>> 1017 mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE030
>> 1018
>> 1019 jbra L(mmu_init_done)
>> 1020
>> 1021 L(spata68040):
>> 1022
>> 1023 mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE_S
>> 1024
>> 1025 jbra L(mmu_init_done)
>> 1026
>> 1027 L(mmu_init_not_atari):
>> 1028 #endif
>> 1029
>> 1030 #ifdef CONFIG_Q40
>> 1031 is_not_q40(L(notq40))
>> 1032 /*
>> 1033 * add transparent mapping for 0xff00 0000 - 0xffff ffff
>> 1034 * non-cached serialized etc..
>> 1035 * this includes master chip, DAC, RTC and ISA ports
>> 1036 * 0xfe000000-0xfeffffff is for screen and ROM
>> 1037 */
>> 1038
>> 1039 putc 'Q'
>> 1040
>> 1041 mmu_map_tt #0,#0xfe000000,#0x01000000,#_PAGE_CACHE040W
>> 1042 mmu_map_tt #1,#0xff000000,#0x01000000,#_PAGE_NOCACHE_S
>> 1043
>> 1044 jbra L(mmu_init_done)
>> 1045
>> 1046 L(notq40):
>> 1047 #endif
>> 1048
>> 1049 #ifdef CONFIG_HP300
>> 1050 is_not_hp300(L(nothp300))
>> 1051
>> 1052 /* On the HP300, we map the ROM, INTIO and DIO regions (phys. 0x00xxxxxx)
>> 1053 * by mapping 32MB (on 020/030) or 16 MB (on 040) from 0xf0xxxxxx -> 0x00xxxxxx).
>> 1054 * The ROM mapping is needed because the LEDs are mapped there too.
>> 1055 */
66 1056
67 /* Initialize all cache lines within t !! 1057 is_040(1f)
68 movia r1, NIOS2_ICACHE_SIZE <<
69 movui r2, NIOS2_ICACHE_LINE_SIZE <<
70 <<
71 icache_init: <<
72 initi r1 <<
73 sub r1, r1, r2 <<
74 bgt r1, r0, icache_init <<
75 br 1f <<
76 <<
77 /* <<
78 * This is the default location for th <<
79 * to our handler <<
80 */ <<
81 ENTRY(exception_handler_hook) <<
82 movia r24, inthandler <<
83 jmp r24 <<
84 <<
85 ENTRY(fast_handler) <<
86 nextpc et <<
87 helper: <<
88 stw r3, r3save - helper(et) <<
89 <<
90 rdctl r3 , pteaddr <<
91 srli r3, r3, 12 <<
92 slli r3, r3, 2 <<
93 movia et, pgd_current <<
94 <<
95 ldw et, 0(et) <<
96 add r3, et, r3 <<
97 ldw et, 0(r3) <<
98 <<
99 rdctl r3, pteaddr <<
100 andi r3, r3, 0xfff <<
101 add et, r3, et <<
102 ldw et, 0(et) <<
103 wrctl tlbacc, et <<
104 nextpc et <<
105 helper2: <<
106 ldw r3, r3save - helper2(et) <<
107 subi ea, ea, 4 <<
108 eret <<
109 r3save: <<
110 .word 0x0 <<
111 ENTRY(fast_handler_end) <<
112 <<
113 1: <<
114 /* <<
115 * After the instruction cache is init <<
116 * also be initialized. <<
117 */ <<
118 movia r1, NIOS2_DCACHE_SIZE <<
119 movui r2, NIOS2_DCACHE_LINE_SIZE <<
120 <<
121 dcache_init: <<
122 initd 0(r1) <<
123 sub r1, r1, r2 <<
124 bgt r1, r0, dcache_init <<
125 <<
126 nextpc r1 /* Fin <<
127 chkadr: <<
128 movia r2, chkadr <<
129 beq r1, r2,finish_move /* We <<
130 addi r1, r1,(_start - chkadr) <<
131 movia r2, _start /* Des <<
132 movia r3, __bss_start /* End <<
133 <<
134 loop_move: /* r1: <<
135 ldw r8, 0(r1) /* loa <<
136 stw r8, 0(r2) /* sto <<
137 flushd 0(r2) /* Flu <<
138 addi r1, r1, 4 /* inc <<
139 addi r2, r2, 4 /* inc <<
140 blt r2, r3, loop_move <<
141 <<
142 movia r1, finish_move /* VMA <<
143 jmp r1 /* jmp <<
144 <<
145 finish_move: <<
146 <<
147 /* Mask off all possible interrupts */ <<
148 wrctl ienable, r0 <<
149 <<
150 /* Clear .bss */ <<
151 movia r2, __bss_start <<
152 movia r1, __bss_stop <<
153 1: <<
154 stb r0, 0(r2) <<
155 addi r2, r2, 1 <<
156 bne r1, r2, 1b <<
157 <<
158 movia r1, init_thread_union /* set <<
159 addi sp, r1, THREAD_SIZE <<
160 movia r2, _current_thread /* Rem <<
161 stw r1, 0(r2) <<
162 <<
163 movia r1, nios2_boot_init /* sav <<
164 callr r1 <<
165 <<
166 movia r1, start_kernel /* cal <<
167 callr r1 <<
168 1058
169 /* If we return from start_kernel, bre !! 1059 /*
170 * buggered we are. !! 1060 * 030: Map the 32Meg range physical 0x0 up to logical 0xf000.0000
>> 1061 */
>> 1062 mmu_map #0xf0000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 1063
>> 1064 jbra L(mmu_init_done)
>> 1065
>> 1066 1:
>> 1067 /*
>> 1068 * 040: Map the 16Meg range physical 0x0 up to logical 0xf000.0000
>> 1069 */
>> 1070 mmu_map #0xf0000000,#0,#0x01000000,#_PAGE_NOCACHE_S
>> 1071
>> 1072 jbra L(mmu_init_done)
>> 1073
>> 1074 L(nothp300):
>> 1075 #endif /* CONFIG_HP300 */
>> 1076
>> 1077 #ifdef CONFIG_MVME147
>> 1078
>> 1079 is_not_mvme147(L(not147))
>> 1080
>> 1081 /*
>> 1082 * On MVME147 we have already created kernel page tables for
>> 1083 * 4MB of RAM at address 0, so now need to do a transparent
>> 1084 * mapping of the top of memory space. Make it 0.5GByte for now,
>> 1085 * so we can access on-board i/o areas.
>> 1086 */
>> 1087
>> 1088 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE030
>> 1089
>> 1090 jbra L(mmu_init_done)
>> 1091
>> 1092 L(not147):
>> 1093 #endif /* CONFIG_MVME147 */
>> 1094
>> 1095 #ifdef CONFIG_MVME16x
>> 1096
>> 1097 is_not_mvme16x(L(not16x))
>> 1098
>> 1099 /*
>> 1100 * On MVME16x we have already created kernel page tables for
>> 1101 * 4MB of RAM at address 0, so now need to do a transparent
>> 1102 * mapping of the top of memory space. Make it 0.5GByte for now.
>> 1103 * Supervisor only access, so transparent mapping doesn't
>> 1104 * clash with User code virtual address space.
>> 1105 * this covers IO devices, PROM and SRAM. The PROM and SRAM
>> 1106 * mapping is needed to allow 167Bug to run.
>> 1107 * IO is in the range 0xfff00000 to 0xfffeffff.
>> 1108 * PROM is 0xff800000->0xffbfffff and SRAM is
>> 1109 * 0xffe00000->0xffe1ffff.
>> 1110 */
>> 1111
>> 1112 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S
>> 1113
>> 1114 jbra L(mmu_init_done)
>> 1115
>> 1116 L(not16x):
>> 1117 #endif /* CONFIG_MVME162 | CONFIG_MVME167 */
>> 1118
>> 1119 #ifdef CONFIG_BVME6000
>> 1120
>> 1121 is_not_bvme6000(L(not6000))
>> 1122
>> 1123 /*
>> 1124 * On BVME6000 we have already created kernel page tables for
>> 1125 * 4MB of RAM at address 0, so now need to do a transparent
>> 1126 * mapping of the top of memory space. Make it 0.5GByte for now,
>> 1127 * so we can access on-board i/o areas.
>> 1128 * Supervisor only access, so transparent mapping doesn't
>> 1129 * clash with User code virtual address space.
>> 1130 */
>> 1131
>> 1132 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S
>> 1133
>> 1134 jbra L(mmu_init_done)
>> 1135
>> 1136 L(not6000):
>> 1137 #endif /* CONFIG_BVME6000 */
>> 1138
>> 1139 /*
>> 1140 * mmu_init_mac
>> 1141 *
>> 1142 * The Macintosh mappings are less clear.
>> 1143 *
>> 1144 * Even as of this writing, it is unclear how the
>> 1145 * Macintosh mappings will be done. However, as
>> 1146 * the first author of this code I'm proposing the
>> 1147 * following model:
>> 1148 *
>> 1149 * Map the kernel (that's already done),
>> 1150 * Map the I/O (on most machines that's the
>> 1151 * 0x5000.0000 ... 0x5300.0000 range,
>> 1152 * Map the video frame buffer using as few pages
>> 1153 * as absolutely (this requirement mostly stems from
>> 1154 * the fact that when the frame buffer is at
>> 1155 * 0x0000.0000 then we know there is valid RAM just
>> 1156 * above the screen that we don't want to waste!).
>> 1157 *
>> 1158 * By the way, if the frame buffer is at 0x0000.0000
>> 1159 * then the Macintosh is known as an RBV based Mac.
>> 1160 *
>> 1161 * By the way 2, the code currently maps in a bunch of
>> 1162 * regions. But I'd like to cut that out. (And move most
>> 1163 * of the mappings up into the kernel proper ... or only
>> 1164 * map what's necessary.)
>> 1165 */
>> 1166
>> 1167 #ifdef CONFIG_MAC
>> 1168
>> 1169 L(mmu_init_mac):
>> 1170
>> 1171 is_not_mac(L(mmu_init_not_mac))
>> 1172
>> 1173 putc 'F'
>> 1174
>> 1175 is_not_040_or_060(1f)
>> 1176
>> 1177 moveq #_PAGE_NOCACHE_S,%d3
>> 1178 jbra 2f
>> 1179 1:
>> 1180 moveq #_PAGE_NOCACHE030,%d3
>> 1181 2:
>> 1182 /*
>> 1183 * Mac Note: screen address of logical 0xF000.0000 -> <screen physical>
>> 1184 * we simply map the 4MB that contains the videomem
>> 1185 */
>> 1186
>> 1187 movel #VIDEOMEMMASK,%d0
>> 1188 andl %pc@(L(mac_videobase)),%d0
>> 1189
>> 1190 mmu_map #VIDEOMEMBASE,%d0,#VIDEOMEMSIZE,%d3
>> 1191 /* ROM from 4000 0000 to 4200 0000 (only for mac_reset()) */
>> 1192 mmu_map_eq #0x40000000,#0x02000000,%d3
>> 1193 /* IO devices (incl. serial port) from 5000 0000 to 5300 0000 */
>> 1194 mmu_map_eq #0x50000000,#0x03000000,%d3
>> 1195 /* Nubus slot space (video at 0xF0000000, rom at 0xF0F80000) */
>> 1196 mmu_map_tt #1,#0xf8000000,#0x08000000,%d3
>> 1197
>> 1198 jbra L(mmu_init_done)
>> 1199
>> 1200 L(mmu_init_not_mac):
>> 1201 #endif
>> 1202
>> 1203 #ifdef CONFIG_SUN3X
>> 1204 is_not_sun3x(L(notsun3x))
>> 1205
>> 1206 /* oh, the pain.. We're gonna want the prom code after
>> 1207 * starting the MMU, so we copy the mappings, translating
>> 1208 * from 8k -> 4k pages as we go.
>> 1209 */
>> 1210
>> 1211 /* copy maps from 0xfee00000 to 0xff000000 */
>> 1212 movel #0xfee00000, %d0
>> 1213 moveq #ROOT_INDEX_SHIFT, %d1
>> 1214 lsrl %d1,%d0
>> 1215 mmu_get_root_table_entry %d0
>> 1216
>> 1217 movel #0xfee00000, %d0
>> 1218 moveq #PTR_INDEX_SHIFT, %d1
>> 1219 lsrl %d1,%d0
>> 1220 andl #PTR_TABLE_SIZE-1, %d0
>> 1221 mmu_get_ptr_table_entry %a0,%d0
>> 1222
>> 1223 movel #0xfee00000, %d0
>> 1224 moveq #PAGE_INDEX_SHIFT, %d1
>> 1225 lsrl %d1,%d0
>> 1226 andl #PAGE_TABLE_SIZE-1, %d0
>> 1227 mmu_get_page_table_entry %a0,%d0
>> 1228
>> 1229 /* this is where the prom page table lives */
>> 1230 movel 0xfefe00d4, %a1
>> 1231 movel %a1@, %a1
>> 1232
>> 1233 movel #((0x200000 >> 13)-1), %d1
>> 1234
>> 1235 1:
>> 1236 movel %a1@+, %d3
>> 1237 movel %d3,%a0@+
>> 1238 addl #0x1000,%d3
>> 1239 movel %d3,%a0@+
>> 1240
>> 1241 dbra %d1,1b
>> 1242
>> 1243 /* setup tt1 for I/O */
>> 1244 mmu_map_tt #1,#0x40000000,#0x40000000,#_PAGE_NOCACHE_S
>> 1245 jbra L(mmu_init_done)
>> 1246
>> 1247 L(notsun3x):
>> 1248 #endif
>> 1249
>> 1250 #ifdef CONFIG_VIRT
>> 1251 is_not_virt(L(novirt))
>> 1252 mmu_map_tt #1,#0xFF000000,#0x01000000,#_PAGE_NOCACHE_S
>> 1253 jbra L(mmu_init_done)
>> 1254 L(novirt):
>> 1255 #endif
>> 1256
>> 1257 #ifdef CONFIG_APOLLO
>> 1258 is_not_apollo(L(notapollo))
>> 1259
>> 1260 putc 'P'
>> 1261 mmu_map #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030
>> 1262
>> 1263 L(notapollo):
>> 1264 jbra L(mmu_init_done)
>> 1265 #endif
>> 1266
>> 1267 L(mmu_init_done):
>> 1268
>> 1269 putc 'G'
>> 1270 leds 0x8
>> 1271
>> 1272 /*
>> 1273 * mmu_fixup
>> 1274 *
>> 1275 * On the 040 class machines, all pages that are used for the
>> 1276 * mmu have to be fixed up. According to Motorola, pages holding mmu
>> 1277 * tables should be non-cacheable on a '040 and write-through on a
>> 1278 * '060. But analysis of the reasons for this, and practical
>> 1279 * experience, showed that write-through also works on a '040.
>> 1280 *
>> 1281 * Allocated memory so far goes from kernel_end to memory_start that
>> 1282 * is used for all kind of tables, for that the cache attributes
>> 1283 * are now fixed.
>> 1284 */
>> 1285 L(mmu_fixup):
>> 1286
>> 1287 is_not_040_or_060(L(mmu_fixup_done))
>> 1288
>> 1289 #ifdef MMU_NOCACHE_KERNEL
>> 1290 jbra L(mmu_fixup_done)
>> 1291 #endif
>> 1292
>> 1293 /* first fix the page at the start of the kernel, that
>> 1294 * contains also kernel_pg_dir.
>> 1295 */
>> 1296 movel %pc@(L(phys_kernel_start)),%d0
>> 1297 subl #PAGE_OFFSET,%d0
>> 1298 lea %pc@(_stext),%a0
>> 1299 subl %d0,%a0
>> 1300 mmu_fixup_page_mmu_cache %a0
>> 1301
>> 1302 movel %pc@(L(kernel_end)),%a0
>> 1303 subl %d0,%a0
>> 1304 movel %pc@(L(memory_start)),%a1
>> 1305 subl %d0,%a1
>> 1306 bra 2f
>> 1307 1:
>> 1308 mmu_fixup_page_mmu_cache %a0
>> 1309 addw #PAGESIZE,%a0
>> 1310 2:
>> 1311 cmpl %a0,%a1
>> 1312 jgt 1b
>> 1313
>> 1314 L(mmu_fixup_done):
>> 1315
>> 1316 #ifdef MMU_PRINT
>> 1317 mmu_print
>> 1318 #endif
>> 1319
>> 1320 /*
>> 1321 * mmu_engage
>> 1322 *
>> 1323 * This chunk of code performs the gruesome task of engaging the MMU.
>> 1324 * The reason it's gruesome is because when the MMU becomes engaged it
>> 1325 * maps logical addresses to physical addresses. The Program Counter
>> 1326 * register is then passed through the MMU before the next instruction
>> 1327 * is fetched (the instruction following the engage MMU instruction).
>> 1328 * This may mean one of two things:
>> 1329 * 1. The Program Counter falls within the logical address space of
>> 1330 * the kernel of which there are two sub-possibilities:
>> 1331 * A. The PC maps to the correct instruction (logical PC == physical
>> 1332 * code location), or
>> 1333 * B. The PC does not map through and the processor will read some
>> 1334 * data (or instruction) which is not the logically next instr.
>> 1335 * As you can imagine, A is good and B is bad.
>> 1336 * Alternatively,
>> 1337 * 2. The Program Counter does not map through the MMU. The processor
>> 1338 * will take a Bus Error.
>> 1339 * Clearly, 2 is bad.
>> 1340 * It doesn't take a wiz kid to figure you want 1.A.
>> 1341 * This code creates that possibility.
>> 1342 * There are two possible 1.A. states (we now ignore the other above states):
>> 1343 * A. The kernel is located at physical memory addressed the same as
>> 1344 * the logical memory for the kernel, i.e., 0x01000.
>> 1345 * B. The kernel is located some where else. e.g., 0x0400.0000
>> 1346 *
>> 1347 * Under some conditions the Macintosh can look like A or B.
>> 1348 * [A friend and I once noted that Apple hardware engineers should be
>> 1349 * wacked twice each day: once when they show up at work (as in, Whack!,
>> 1350 * "This is for the screwy hardware we know you're going to design today."),
>> 1351 * and also at the end of the day (as in, Whack! "I don't know what
>> 1352 * you designed today, but I'm sure it wasn't good."). -- rst]
>> 1353 *
>> 1354 * This code works on the following premise:
>> 1355 * If the kernel start (%d5) is within the first 16 Meg of RAM,
>> 1356 * then create a mapping for the kernel at logical 0x8000.0000 to
>> 1357 * the physical location of the pc. And, create a transparent
>> 1358 * translation register for the first 16 Meg. Then, after the MMU
>> 1359 * is engaged, the PC can be moved up into the 0x8000.0000 range
>> 1360 * and then the transparent translation can be turned off and then
>> 1361 * the PC can jump to the correct logical location and it will be
>> 1362 * home (finally). This is essentially the code that the Amiga used
>> 1363 * to use. Now, it's generalized for all processors. Which means
>> 1364 * that a fresh (but temporary) mapping has to be created. The mapping
>> 1365 * is made in page 0 (an as of yet unused location -- except for the
>> 1366 * stack!). This temporary mapping will only require 1 pointer table
>> 1367 * and a single page table (it can map 256K).
>> 1368 *
>> 1369 * OK, alternatively, imagine that the Program Counter is not within
>> 1370 * the first 16 Meg. Then, just use Transparent Translation registers
>> 1371 * to do the right thing.
>> 1372 *
>> 1373 * Last, if _start is already at 0x01000, then there's nothing special
>> 1374 * to do (in other words, in a degenerate case of the first case above,
>> 1375 * do nothing).
>> 1376 *
>> 1377 * Let's do it.
>> 1378 *
>> 1379 *
>> 1380 */
>> 1381
>> 1382 putc 'H'
>> 1383
>> 1384 mmu_engage
>> 1385
>> 1386 /*
>> 1387 * After this point no new memory is allocated and
>> 1388 * the start of available memory is stored in availmem.
>> 1389 * (The bootmem allocator requires now the physical address.)
>> 1390 */
>> 1391
>> 1392 movel L(memory_start),availmem
>> 1393
>> 1394 #ifdef CONFIG_AMIGA
>> 1395 is_not_amiga(1f)
>> 1396 /* fixup the Amiga custom register location before printing */
>> 1397 clrl L(custom)
>> 1398 1:
>> 1399 #endif
>> 1400
>> 1401 #ifdef CONFIG_ATARI
>> 1402 is_not_atari(1f)
>> 1403 /* fixup the Atari iobase register location before printing */
>> 1404 movel #0xff000000,L(iobase)
>> 1405 1:
>> 1406 #endif
>> 1407
>> 1408 #ifdef CONFIG_MAC
>> 1409 is_not_mac(1f)
>> 1410 movel #~VIDEOMEMMASK,%d0
>> 1411 andl L(mac_videobase),%d0
>> 1412 addl #VIDEOMEMBASE,%d0
>> 1413 movel %d0,L(mac_videobase)
>> 1414 #ifdef CONSOLE_DEBUG
>> 1415 movel %pc@(L(phys_kernel_start)),%d0
>> 1416 subl #PAGE_OFFSET,%d0
>> 1417 subl %d0,L(console_font)
>> 1418 subl %d0,L(console_font_data)
>> 1419 #endif
>> 1420 orl #0x50000000,L(mac_sccbase)
>> 1421 1:
>> 1422 #endif
>> 1423
>> 1424 #ifdef CONFIG_HP300
>> 1425 is_not_hp300(2f)
>> 1426 /*
>> 1427 * Fix up the iobase register to point to the new location of the LEDs.
>> 1428 */
>> 1429 movel #0xf0000000,L(iobase)
>> 1430
>> 1431 /*
>> 1432 * Energise the FPU and caches.
>> 1433 */
>> 1434 is_040(1f)
>> 1435 movel #0x60,0xf05f400c
>> 1436 jbra 2f
>> 1437
>> 1438 /*
>> 1439 * 040: slightly different, apparently.
>> 1440 */
>> 1441 1: movew #0,0xf05f400e
>> 1442 movew #0x64,0xf05f400e
>> 1443 2:
>> 1444 #endif
>> 1445
>> 1446 #ifdef CONFIG_SUN3X
>> 1447 is_not_sun3x(1f)
>> 1448
>> 1449 /* enable copro */
>> 1450 oriw #0x4000,0x61000000
>> 1451 1:
>> 1452 #endif
>> 1453
>> 1454 #ifdef CONFIG_APOLLO
>> 1455 is_not_apollo(1f)
>> 1456
>> 1457 /*
>> 1458 * Fix up the iobase before printing
>> 1459 */
>> 1460 movel #0x80000000,L(iobase)
>> 1461 1:
>> 1462 #endif
>> 1463
>> 1464 putc 'I'
>> 1465 leds 0x10
>> 1466
>> 1467 /*
>> 1468 * Enable caches
>> 1469 */
>> 1470
>> 1471 is_not_040_or_060(L(cache_not_680460))
>> 1472
>> 1473 L(cache680460):
>> 1474 .chip 68040
>> 1475 nop
>> 1476 cpusha %bc
>> 1477 nop
>> 1478
>> 1479 is_060(L(cache68060))
>> 1480
>> 1481 movel #CC6_ENABLE_D+CC6_ENABLE_I,%d0
>> 1482 /* MMU stuff works in copyback mode now, so enable the cache */
>> 1483 movec %d0,%cacr
>> 1484 jra L(cache_done)
>> 1485
>> 1486 L(cache68060):
>> 1487 movel #CC6_ENABLE_D+CC6_ENABLE_I+CC6_ENABLE_SB+CC6_PUSH_DPI+CC6_ENABLE_B+CC6_CLRA_B,%d0
>> 1488 /* MMU stuff works in copyback mode now, so enable the cache */
>> 1489 movec %d0,%cacr
>> 1490 /* enable superscalar dispatch in PCR */
>> 1491 moveq #1,%d0
>> 1492 .chip 68060
>> 1493 movec %d0,%pcr
>> 1494
>> 1495 jbra L(cache_done)
>> 1496 L(cache_not_680460):
>> 1497 L(cache68030):
>> 1498 .chip 68030
>> 1499 movel #CC3_ENABLE_DB+CC3_CLR_D+CC3_ENABLE_D+CC3_ENABLE_IB+CC3_CLR_I+CC3_ENABLE_I,%d0
>> 1500 movec %d0,%cacr
>> 1501
>> 1502 jra L(cache_done)
>> 1503 .chip 68k
>> 1504 L(cache_done):
>> 1505
>> 1506 putc 'J'
>> 1507
>> 1508 /*
>> 1509 * Setup initial stack pointer
>> 1510 */
>> 1511 lea init_task,%curptr
>> 1512 lea init_thread_union+THREAD_SIZE,%sp
>> 1513
>> 1514 putc 'K'
>> 1515
>> 1516 subl %a6,%a6 /* clear a6 for gdb */
>> 1517
>> 1518 /*
>> 1519 * The new 64bit printf support requires an early exception initialization.
>> 1520 */
>> 1521 jbsr base_trap_init
>> 1522
>> 1523 /* jump to the kernel start */
>> 1524
>> 1525 putc '\n'
>> 1526 leds 0x55
>> 1527
>> 1528 jbsr start_kernel
>> 1529
>> 1530 /*
>> 1531 * Find a tag record in the bootinfo structure
>> 1532 * The bootinfo structure is located right after the kernel
>> 1533 * Returns: d0: size (-1 if not found)
>> 1534 * a0: data pointer (end-of-records if not found)
>> 1535 */
>> 1536 func_start get_bi_record,%d1
>> 1537
>> 1538 movel ARG1,%d0
>> 1539 lea %pc@(_end),%a0
>> 1540 1: tstw %a0@(BIR_TAG)
>> 1541 jeq 3f
>> 1542 cmpw %a0@(BIR_TAG),%d0
>> 1543 jeq 2f
>> 1544 addw %a0@(BIR_SIZE),%a0
>> 1545 jra 1b
>> 1546 2: moveq #0,%d0
>> 1547 movew %a0@(BIR_SIZE),%d0
>> 1548 lea %a0@(BIR_DATA),%a0
>> 1549 jra 4f
>> 1550 3: moveq #-1,%d0
>> 1551 lea %a0@(BIR_SIZE),%a0
>> 1552 4:
>> 1553 func_return get_bi_record
>> 1554
>> 1555
>> 1556 /*
>> 1557 * MMU Initialization Begins Here
>> 1558 *
>> 1559 * The structure of the MMU tables on the 68k machines
>> 1560 * is thus:
>> 1561 * Root Table
>> 1562 * Logical addresses are translated through
>> 1563 * a hierarchical translation mechanism where the high-order
>> 1564 * seven bits of the logical address (LA) are used as an
>> 1565 * index into the "root table." Each entry in the root
>> 1566 * table has a bit which specifies if it's a valid pointer to a
>> 1567 * pointer table. Each entry defines a 32Meg range of memory.
>> 1568 * If an entry is invalid then that logical range of 32M is
>> 1569 * invalid and references to that range of memory (when the MMU
>> 1570 * is enabled) will fault. If the entry is valid, then it does
>> 1571 * one of two things. On 040/060 class machines, it points to
>> 1572 * a pointer table which then describes more finely the memory
>> 1573 * within that 32M range. On 020/030 class machines, a technique
>> 1574 * called "early terminating descriptors" are used. This technique
>> 1575 * allows an entire 32Meg to be described by a single entry in the
>> 1576 * root table. Thus, this entry in the root table, contains the
>> 1577 * physical address of the memory or I/O at the logical address
>> 1578 * which the entry represents and it also contains the necessary
>> 1579 * cache bits for this region.
>> 1580 *
>> 1581 * Pointer Tables
>> 1582 * Per the Root Table, there will be one or more
>> 1583 * pointer tables. Each pointer table defines a 32M range.
>> 1584 * Not all of the 32M range need be defined. Again, the next
>> 1585 * seven bits of the logical address are used an index into
>> 1586 * the pointer table to point to page tables (if the pointer
>> 1587 * is valid). There will undoubtedly be more than one
>> 1588 * pointer table for the kernel because each pointer table
>> 1589 * defines a range of only 32M. Valid pointer table entries
>> 1590 * point to page tables, or are early terminating entries
>> 1591 * themselves.
>> 1592 *
>> 1593 * Page Tables
>> 1594 * Per the Pointer Tables, each page table entry points
>> 1595 * to the physical page in memory that supports the logical
>> 1596 * address that translates to the particular index.
>> 1597 *
>> 1598 * In short, the Logical Address gets translated as follows:
>> 1599 * bits 31..26 - index into the Root Table
>> 1600 * bits 25..18 - index into the Pointer Table
>> 1601 * bits 17..12 - index into the Page Table
>> 1602 * bits 11..0 - offset into a particular 4K page
>> 1603 *
>> 1604 * The algorithms which follow do one thing: they abstract
>> 1605 * the MMU hardware. For example, there are three kinds of
>> 1606 * cache settings that are relevant. Either, memory is
>> 1607 * being mapped in which case it is either Kernel Code (or
>> 1608 * the RamDisk) or it is MMU data. On the 030, the MMU data
>> 1609 * option also describes the kernel. Or, I/O is being mapped
>> 1610 * in which case it has its own kind of cache bits. There
>> 1611 * are constants which abstract these notions from the code that
>> 1612 * actually makes the call to map some range of memory.
>> 1613 *
>> 1614 *
>> 1615 *
>> 1616 */
>> 1617
>> 1618 #ifdef MMU_PRINT
>> 1619 /*
>> 1620 * mmu_print
>> 1621 *
>> 1622 * This algorithm will print out the current MMU mappings.
>> 1623 *
>> 1624 * Input:
>> 1625 * %a5 points to the root table. Everything else is calculated
>> 1626 * from this.
>> 1627 */
>> 1628
>> 1629 #define mmu_next_valid 0
>> 1630 #define mmu_start_logical 4
>> 1631 #define mmu_next_logical 8
>> 1632 #define mmu_start_physical 12
>> 1633 #define mmu_next_physical 16
>> 1634
>> 1635 #define MMU_PRINT_INVALID -1
>> 1636 #define MMU_PRINT_VALID 1
>> 1637 #define MMU_PRINT_UNINITED 0
>> 1638
>> 1639 #define putZc(z,n) jbne 1f; putc z; jbra 2f; 1: putc n; 2:
>> 1640
>> 1641 func_start mmu_print,%a0-%a6/%d0-%d7
>> 1642
>> 1643 movel %pc@(L(kernel_pgdir_ptr)),%a5
>> 1644 lea %pc@(L(mmu_print_data)),%a0
>> 1645 movel #MMU_PRINT_UNINITED,%a0@(mmu_next_valid)
>> 1646
>> 1647 is_not_040_or_060(mmu_030_print)
>> 1648
>> 1649 mmu_040_print:
>> 1650 puts "\nMMU040\n"
>> 1651 puts "rp:"
>> 1652 putn %a5
>> 1653 putc '\n'
>> 1654 #if 0
>> 1655 /*
>> 1656 * The following #if/#endif block is a tight algorithm for dumping the 040
>> 1657 * MMU Map in gory detail. It really isn't that practical unless the
>> 1658 * MMU Map algorithm appears to go awry and you need to debug it at the
>> 1659 * entry per entry level.
171 */ 1660 */
172 break !! 1661 movel #ROOT_TABLE_SIZE,%d5
>> 1662 #if 0
>> 1663 movel %a5@+,%d7 | Burn an entry to skip the kernel mappings,
>> 1664 subql #1,%d5 | they (might) work
>> 1665 #endif
>> 1666 1: tstl %d5
>> 1667 jbeq mmu_print_done
>> 1668 subq #1,%d5
>> 1669 movel %a5@+,%d7
>> 1670 btst #1,%d7
>> 1671 jbeq 1b
>> 1672
>> 1673 2: putn %d7
>> 1674 andil #0xFFFFFE00,%d7
>> 1675 movel %d7,%a4
>> 1676 movel #PTR_TABLE_SIZE,%d4
>> 1677 putc ' '
>> 1678 3: tstl %d4
>> 1679 jbeq 11f
>> 1680 subq #1,%d4
>> 1681 movel %a4@+,%d7
>> 1682 btst #1,%d7
>> 1683 jbeq 3b
>> 1684
>> 1685 4: putn %d7
>> 1686 andil #0xFFFFFF00,%d7
>> 1687 movel %d7,%a3
>> 1688 movel #PAGE_TABLE_SIZE,%d3
>> 1689 5: movel #8,%d2
>> 1690 6: tstl %d3
>> 1691 jbeq 31f
>> 1692 subq #1,%d3
>> 1693 movel %a3@+,%d6
>> 1694 btst #0,%d6
>> 1695 jbeq 6b
>> 1696 7: tstl %d2
>> 1697 jbeq 8f
>> 1698 subq #1,%d2
>> 1699 putc ' '
>> 1700 jbra 91f
>> 1701 8: putc '\n'
>> 1702 movel #8+1+8+1+1,%d2
>> 1703 9: putc ' '
>> 1704 dbra %d2,9b
>> 1705 movel #7,%d2
>> 1706 91: putn %d6
>> 1707 jbra 6b
>> 1708
>> 1709 31: putc '\n'
>> 1710 movel #8+1,%d2
>> 1711 32: putc ' '
>> 1712 dbra %d2,32b
>> 1713 jbra 3b
>> 1714
>> 1715 11: putc '\n'
>> 1716 jbra 1b
>> 1717 #endif /* MMU 040 Dumping code that's gory and detailed */
>> 1718
>> 1719 lea %pc@(kernel_pg_dir),%a5
>> 1720 movel %a5,%a0 /* a0 has the address of the root table ptr */
>> 1721 movel #0x00000000,%a4 /* logical address */
>> 1722 moveql #0,%d0
>> 1723 40:
>> 1724 /* Increment the logical address and preserve in d5 */
>> 1725 movel %a4,%d5
>> 1726 addil #PAGESIZE<<13,%d5
>> 1727 movel %a0@+,%d6
>> 1728 btst #1,%d6
>> 1729 jbne 41f
>> 1730 jbsr mmu_print_tuple_invalidate
>> 1731 jbra 48f
>> 1732 41:
>> 1733 movel #0,%d1
>> 1734 andil #0xfffffe00,%d6
>> 1735 movel %d6,%a1
>> 1736 42:
>> 1737 movel %a4,%d5
>> 1738 addil #PAGESIZE<<6,%d5
>> 1739 movel %a1@+,%d6
>> 1740 btst #1,%d6
>> 1741 jbne 43f
>> 1742 jbsr mmu_print_tuple_invalidate
>> 1743 jbra 47f
>> 1744 43:
>> 1745 movel #0,%d2
>> 1746 andil #0xffffff00,%d6
>> 1747 movel %d6,%a2
>> 1748 44:
>> 1749 movel %a4,%d5
>> 1750 addil #PAGESIZE,%d5
>> 1751 movel %a2@+,%d6
>> 1752 btst #0,%d6
>> 1753 jbne 45f
>> 1754 jbsr mmu_print_tuple_invalidate
>> 1755 jbra 46f
>> 1756 45:
>> 1757 moveml %d0-%d1,%sp@-
>> 1758 movel %a4,%d0
>> 1759 movel %d6,%d1
>> 1760 andil #0xfffff4e0,%d1
>> 1761 lea %pc@(mmu_040_print_flags),%a6
>> 1762 jbsr mmu_print_tuple
>> 1763 moveml %sp@+,%d0-%d1
>> 1764 46:
>> 1765 movel %d5,%a4
>> 1766 addq #1,%d2
>> 1767 cmpib #64,%d2
>> 1768 jbne 44b
>> 1769 47:
>> 1770 movel %d5,%a4
>> 1771 addq #1,%d1
>> 1772 cmpib #128,%d1
>> 1773 jbne 42b
>> 1774 48:
>> 1775 movel %d5,%a4 /* move to the next logical address */
>> 1776 addq #1,%d0
>> 1777 cmpib #128,%d0
>> 1778 jbne 40b
>> 1779
>> 1780 .chip 68040
>> 1781 movec %dtt1,%d0
>> 1782 movel %d0,%d1
>> 1783 andiw #0x8000,%d1 /* is it valid ? */
>> 1784 jbeq 1f /* No, bail out */
>> 1785
>> 1786 movel %d0,%d1
>> 1787 andil #0xff000000,%d1 /* Get the address */
>> 1788 putn %d1
>> 1789 puts "=="
>> 1790 putn %d1
>> 1791
>> 1792 movel %d0,%d6
>> 1793 jbsr mmu_040_print_flags_tt
>> 1794 1:
>> 1795 movec %dtt0,%d0
>> 1796 movel %d0,%d1
>> 1797 andiw #0x8000,%d1 /* is it valid ? */
>> 1798 jbeq 1f /* No, bail out */
>> 1799
>> 1800 movel %d0,%d1
>> 1801 andil #0xff000000,%d1 /* Get the address */
>> 1802 putn %d1
>> 1803 puts "=="
>> 1804 putn %d1
>> 1805
>> 1806 movel %d0,%d6
>> 1807 jbsr mmu_040_print_flags_tt
>> 1808 1:
>> 1809 .chip 68k
>> 1810
>> 1811 jbra mmu_print_done
>> 1812
>> 1813 mmu_040_print_flags:
>> 1814 btstl #10,%d6
>> 1815 putZc(' ','G') /* global bit */
>> 1816 btstl #7,%d6
>> 1817 putZc(' ','S') /* supervisor bit */
>> 1818 mmu_040_print_flags_tt:
>> 1819 btstl #6,%d6
>> 1820 jbne 3f
>> 1821 putc 'C'
>> 1822 btstl #5,%d6
>> 1823 putZc('w','c') /* write through or copy-back */
>> 1824 jbra 4f
>> 1825 3:
>> 1826 putc 'N'
>> 1827 btstl #5,%d6
>> 1828 putZc('s',' ') /* serialized non-cacheable, or non-cacheable */
>> 1829 4:
>> 1830 rts
>> 1831
>> 1832 mmu_030_print_flags:
>> 1833 btstl #6,%d6
>> 1834 putZc('C','I') /* write through or copy-back */
>> 1835 rts
>> 1836
>> 1837 mmu_030_print:
>> 1838 puts "\nMMU030\n"
>> 1839 puts "\nrp:"
>> 1840 putn %a5
>> 1841 putc '\n'
>> 1842 movel %a5,%d0
>> 1843 andil #0xfffffff0,%d0
>> 1844 movel %d0,%a0
>> 1845 movel #0x00000000,%a4 /* logical address */
>> 1846 movel #0,%d0
>> 1847 30:
>> 1848 movel %a4,%d5
>> 1849 addil #PAGESIZE<<13,%d5
>> 1850 movel %a0@+,%d6
>> 1851 btst #1,%d6 /* is it a table ptr? */
>> 1852 jbne 31f /* yes */
>> 1853 btst #0,%d6 /* is it early terminating? */
>> 1854 jbeq 1f /* no */
>> 1855 jbsr mmu_030_print_helper
>> 1856 jbra 38f
>> 1857 1:
>> 1858 jbsr mmu_print_tuple_invalidate
>> 1859 jbra 38f
>> 1860 31:
>> 1861 movel #0,%d1
>> 1862 andil #0xfffffff0,%d6
>> 1863 movel %d6,%a1
>> 1864 32:
>> 1865 movel %a4,%d5
>> 1866 addil #PAGESIZE<<6,%d5
>> 1867 movel %a1@+,%d6
>> 1868 btst #1,%d6 /* is it a table ptr? */
>> 1869 jbne 33f /* yes */
>> 1870 btst #0,%d6 /* is it a page descriptor? */
>> 1871 jbeq 1f /* no */
>> 1872 jbsr mmu_030_print_helper
>> 1873 jbra 37f
>> 1874 1:
>> 1875 jbsr mmu_print_tuple_invalidate
>> 1876 jbra 37f
>> 1877 33:
>> 1878 movel #0,%d2
>> 1879 andil #0xfffffff0,%d6
>> 1880 movel %d6,%a2
>> 1881 34:
>> 1882 movel %a4,%d5
>> 1883 addil #PAGESIZE,%d5
>> 1884 movel %a2@+,%d6
>> 1885 btst #0,%d6
>> 1886 jbne 35f
>> 1887 jbsr mmu_print_tuple_invalidate
>> 1888 jbra 36f
>> 1889 35:
>> 1890 jbsr mmu_030_print_helper
>> 1891 36:
>> 1892 movel %d5,%a4
>> 1893 addq #1,%d2
>> 1894 cmpib #64,%d2
>> 1895 jbne 34b
>> 1896 37:
>> 1897 movel %d5,%a4
>> 1898 addq #1,%d1
>> 1899 cmpib #128,%d1
>> 1900 jbne 32b
>> 1901 38:
>> 1902 movel %d5,%a4 /* move to the next logical address */
>> 1903 addq #1,%d0
>> 1904 cmpib #128,%d0
>> 1905 jbne 30b
>> 1906
>> 1907 mmu_print_done:
>> 1908 puts "\n"
>> 1909
>> 1910 func_return mmu_print
>> 1911
>> 1912
>> 1913 mmu_030_print_helper:
>> 1914 moveml %d0-%d1,%sp@-
>> 1915 movel %a4,%d0
>> 1916 movel %d6,%d1
>> 1917 lea %pc@(mmu_030_print_flags),%a6
>> 1918 jbsr mmu_print_tuple
>> 1919 moveml %sp@+,%d0-%d1
>> 1920 rts
>> 1921
>> 1922 mmu_print_tuple_invalidate:
>> 1923 moveml %a0/%d7,%sp@-
>> 1924
>> 1925 lea %pc@(L(mmu_print_data)),%a0
>> 1926 tstl %a0@(mmu_next_valid)
>> 1927 jbmi mmu_print_tuple_invalidate_exit
>> 1928
>> 1929 movel #MMU_PRINT_INVALID,%a0@(mmu_next_valid)
>> 1930
>> 1931 putn %a4
>> 1932
>> 1933 puts "##\n"
>> 1934
>> 1935 mmu_print_tuple_invalidate_exit:
>> 1936 moveml %sp@+,%a0/%d7
>> 1937 rts
>> 1938
>> 1939
>> 1940 mmu_print_tuple:
>> 1941 moveml %d0-%d7/%a0,%sp@-
>> 1942
>> 1943 lea %pc@(L(mmu_print_data)),%a0
>> 1944
>> 1945 tstl %a0@(mmu_next_valid)
>> 1946 jble mmu_print_tuple_print
>> 1947
>> 1948 cmpl %a0@(mmu_next_physical),%d1
>> 1949 jbeq mmu_print_tuple_increment
>> 1950
>> 1951 mmu_print_tuple_print:
>> 1952 putn %d0
>> 1953 puts "->"
>> 1954 putn %d1
>> 1955
>> 1956 movel %d1,%d6
>> 1957 jbsr %a6@
>> 1958
>> 1959 mmu_print_tuple_record:
>> 1960 movel #MMU_PRINT_VALID,%a0@(mmu_next_valid)
>> 1961
>> 1962 movel %d1,%a0@(mmu_next_physical)
>> 1963
>> 1964 mmu_print_tuple_increment:
>> 1965 movel %d5,%d7
>> 1966 subl %a4,%d7
>> 1967 addl %d7,%a0@(mmu_next_physical)
>> 1968
>> 1969 mmu_print_tuple_exit:
>> 1970 moveml %sp@+,%d0-%d7/%a0
>> 1971 rts
>> 1972
>> 1973 mmu_print_machine_cpu_types:
>> 1974 puts "machine: "
>> 1975
>> 1976 is_not_amiga(1f)
>> 1977 puts "amiga"
>> 1978 jbra 9f
>> 1979 1:
>> 1980 is_not_atari(2f)
>> 1981 puts "atari"
>> 1982 jbra 9f
>> 1983 2:
>> 1984 is_not_mac(3f)
>> 1985 puts "macintosh"
>> 1986 jbra 9f
>> 1987 3: puts "unknown"
>> 1988 9: putc '\n'
>> 1989
>> 1990 puts "cputype: 0"
>> 1991 is_not_060(1f)
>> 1992 putc '6'
>> 1993 jbra 9f
>> 1994 1:
>> 1995 is_not_040_or_060(2f)
>> 1996 putc '4'
>> 1997 jbra 9f
>> 1998 2: putc '3'
>> 1999 9: putc '0'
>> 2000 putc '\n'
>> 2001
>> 2002 rts
>> 2003 #endif /* MMU_PRINT */
>> 2004
>> 2005 /*
>> 2006 * mmu_map_tt
>> 2007 *
>> 2008 * This is a specific function which works on all 680x0 machines.
>> 2009 * On 030, 040 & 060 it will attempt to use Transparent Translation
>> 2010 * registers (tt1).
>> 2011 * On 020 it will call the standard mmu_map which will use early
>> 2012 * terminating descriptors.
>> 2013 */
>> 2014 func_start mmu_map_tt,%d0/%d1/%a0,4
>> 2015
>> 2016 dputs "mmu_map_tt:"
>> 2017 dputn ARG1
>> 2018 dputn ARG2
>> 2019 dputn ARG3
>> 2020 dputn ARG4
>> 2021 dputc '\n'
>> 2022
>> 2023 is_020(L(do_map))
>> 2024
>> 2025 /* Extract the highest bit set
>> 2026 */
>> 2027 bfffo ARG3{#0,#32},%d1
>> 2028 cmpw #8,%d1
>> 2029 jcc L(do_map)
>> 2030
>> 2031 /* And get the mask
>> 2032 */
>> 2033 moveq #-1,%d0
>> 2034 lsrl %d1,%d0
>> 2035 lsrl #1,%d0
>> 2036
>> 2037 /* Mask the address
>> 2038 */
>> 2039 movel %d0,%d1
>> 2040 notl %d1
>> 2041 andl ARG2,%d1
>> 2042
>> 2043 /* Generate the upper 16bit of the tt register
>> 2044 */
>> 2045 lsrl #8,%d0
>> 2046 orl %d0,%d1
>> 2047 clrw %d1
>> 2048
>> 2049 is_040_or_060(L(mmu_map_tt_040))
>> 2050
>> 2051 /* set 030 specific bits (read/write access for supervisor mode
>> 2052 * (highest function code set, lower two bits masked))
>> 2053 */
>> 2054 orw #TTR_ENABLE+TTR_RWM+TTR_FCB2+TTR_FCM1+TTR_FCM0,%d1
>> 2055 movel ARG4,%d0
>> 2056 btst #6,%d0
>> 2057 jeq 1f
>> 2058 orw #TTR_CI,%d1
>> 2059
>> 2060 1: lea STACK,%a0
>> 2061 dputn %d1
>> 2062 movel %d1,%a0@
>> 2063 .chip 68030
>> 2064 tstl ARG1
>> 2065 jne 1f
>> 2066 pmove %a0@,%tt0
>> 2067 jra 2f
>> 2068 1: pmove %a0@,%tt1
>> 2069 2: .chip 68k
>> 2070 jra L(mmu_map_tt_done)
>> 2071
>> 2072 /* set 040 specific bits
>> 2073 */
>> 2074 L(mmu_map_tt_040):
>> 2075 orw #TTR_ENABLE+TTR_KERNELMODE,%d1
>> 2076 orl ARG4,%d1
>> 2077 dputn %d1
>> 2078
>> 2079 .chip 68040
>> 2080 tstl ARG1
>> 2081 jne 1f
>> 2082 movec %d1,%itt0
>> 2083 movec %d1,%dtt0
>> 2084 jra 2f
>> 2085 1: movec %d1,%itt1
>> 2086 movec %d1,%dtt1
>> 2087 2: .chip 68k
>> 2088
>> 2089 jra L(mmu_map_tt_done)
>> 2090
>> 2091 L(do_map):
>> 2092 mmu_map_eq ARG2,ARG3,ARG4
>> 2093
>> 2094 L(mmu_map_tt_done):
>> 2095
>> 2096 func_return mmu_map_tt
>> 2097
>> 2098 /*
>> 2099 * mmu_map
>> 2100 *
>> 2101 * This routine will map a range of memory using a pointer
>> 2102 * table and allocate the pages on the fly from the kernel.
>> 2103 * The pointer table does not have to be already linked into
>> 2104 * the root table, this routine will do that if necessary.
>> 2105 *
>> 2106 * NOTE
>> 2107 * This routine will assert failure and use the serial_putc
>> 2108 * routines in the case of a run-time error. For example,
>> 2109 * if the address is already mapped.
>> 2110 *
>> 2111 * NOTE-2
>> 2112 * This routine will use early terminating descriptors
>> 2113 * where possible for the 68020+68851 and 68030 type
>> 2114 * processors.
>> 2115 */
>> 2116 func_start mmu_map,%d0-%d4/%a0-%a4
>> 2117
>> 2118 dputs "\nmmu_map:"
>> 2119 dputn ARG1
>> 2120 dputn ARG2
>> 2121 dputn ARG3
>> 2122 dputn ARG4
>> 2123 dputc '\n'
>> 2124
>> 2125 /* Get logical address and round it down to 256KB
>> 2126 */
>> 2127 movel ARG1,%d0
>> 2128 andl #-(PAGESIZE*PAGE_TABLE_SIZE),%d0
>> 2129 movel %d0,%a3
>> 2130
>> 2131 /* Get the end address
>> 2132 */
>> 2133 movel ARG1,%a4
>> 2134 addl ARG3,%a4
>> 2135 subql #1,%a4
>> 2136
>> 2137 /* Get physical address and round it down to 256KB
>> 2138 */
>> 2139 movel ARG2,%d0
>> 2140 andl #-(PAGESIZE*PAGE_TABLE_SIZE),%d0
>> 2141 movel %d0,%a2
>> 2142
>> 2143 /* Add page attributes to the physical address
>> 2144 */
>> 2145 movel ARG4,%d0
>> 2146 orw #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0
>> 2147 addw %d0,%a2
>> 2148
>> 2149 dputn %a2
>> 2150 dputn %a3
>> 2151 dputn %a4
>> 2152
>> 2153 is_not_040_or_060(L(mmu_map_030))
>> 2154
>> 2155 addw #_PAGE_GLOBAL040,%a2
>> 2156 /*
>> 2157 * MMU 040 & 060 Support
>> 2158 *
>> 2159 * The MMU usage for the 040 and 060 is different enough from
>> 2160 * the 030 and 68851 that there is separate code. This comment
>> 2161 * block describes the data structures and algorithms built by
>> 2162 * this code.
>> 2163 *
>> 2164 * The 040 does not support early terminating descriptors, as
>> 2165 * the 030 does. Therefore, a third level of table is needed
>> 2166 * for the 040, and that would be the page table. In Linux,
>> 2167 * page tables are allocated directly from the memory above the
>> 2168 * kernel.
>> 2169 *
>> 2170 */
>> 2171
>> 2172 L(mmu_map_040):
>> 2173 /* Calculate the offset into the root table
>> 2174 */
>> 2175 movel %a3,%d0
>> 2176 moveq #ROOT_INDEX_SHIFT,%d1
>> 2177 lsrl %d1,%d0
>> 2178 mmu_get_root_table_entry %d0
>> 2179
>> 2180 /* Calculate the offset into the pointer table
>> 2181 */
>> 2182 movel %a3,%d0
>> 2183 moveq #PTR_INDEX_SHIFT,%d1
>> 2184 lsrl %d1,%d0
>> 2185 andl #PTR_TABLE_SIZE-1,%d0
>> 2186 mmu_get_ptr_table_entry %a0,%d0
>> 2187
>> 2188 /* Calculate the offset into the page table
>> 2189 */
>> 2190 movel %a3,%d0
>> 2191 moveq #PAGE_INDEX_SHIFT,%d1
>> 2192 lsrl %d1,%d0
>> 2193 andl #PAGE_TABLE_SIZE-1,%d0
>> 2194 mmu_get_page_table_entry %a0,%d0
>> 2195
>> 2196 /* The page table entry must not no be busy
>> 2197 */
>> 2198 tstl %a0@
>> 2199 jne L(mmu_map_error)
>> 2200
>> 2201 /* Do the mapping and advance the pointers
>> 2202 */
>> 2203 movel %a2,%a0@
>> 2204 2:
>> 2205 addw #PAGESIZE,%a2
>> 2206 addw #PAGESIZE,%a3
>> 2207
>> 2208 /* Ready with mapping?
>> 2209 */
>> 2210 lea %a3@(-1),%a0
>> 2211 cmpl %a0,%a4
>> 2212 jhi L(mmu_map_040)
>> 2213 jra L(mmu_map_done)
>> 2214
>> 2215 L(mmu_map_030):
>> 2216 /* Calculate the offset into the root table
>> 2217 */
>> 2218 movel %a3,%d0
>> 2219 moveq #ROOT_INDEX_SHIFT,%d1
>> 2220 lsrl %d1,%d0
>> 2221 mmu_get_root_table_entry %d0
>> 2222
>> 2223 /* Check if logical address 32MB aligned,
>> 2224 * so we can try to map it once
>> 2225 */
>> 2226 movel %a3,%d0
>> 2227 andl #(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1)&(-ROOT_TABLE_SIZE),%d0
>> 2228 jne 1f
>> 2229
>> 2230 /* Is there enough to map for 32MB at once
>> 2231 */
>> 2232 lea %a3@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1),%a1
>> 2233 cmpl %a1,%a4
>> 2234 jcs 1f
>> 2235
>> 2236 addql #1,%a1
>> 2237
>> 2238 /* The root table entry must not no be busy
>> 2239 */
>> 2240 tstl %a0@
>> 2241 jne L(mmu_map_error)
>> 2242
>> 2243 /* Do the mapping and advance the pointers
>> 2244 */
>> 2245 dputs "early term1"
>> 2246 dputn %a2
>> 2247 dputn %a3
>> 2248 dputn %a1
>> 2249 dputc '\n'
>> 2250 movel %a2,%a0@
>> 2251
>> 2252 movel %a1,%a3
>> 2253 lea %a2@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE),%a2
>> 2254 jra L(mmu_mapnext_030)
>> 2255 1:
>> 2256 /* Calculate the offset into the pointer table
>> 2257 */
>> 2258 movel %a3,%d0
>> 2259 moveq #PTR_INDEX_SHIFT,%d1
>> 2260 lsrl %d1,%d0
>> 2261 andl #PTR_TABLE_SIZE-1,%d0
>> 2262 mmu_get_ptr_table_entry %a0,%d0
>> 2263
>> 2264 /* The pointer table entry must not no be busy
>> 2265 */
>> 2266 tstl %a0@
>> 2267 jne L(mmu_map_error)
>> 2268
>> 2269 /* Do the mapping and advance the pointers
>> 2270 */
>> 2271 dputs "early term2"
>> 2272 dputn %a2
>> 2273 dputn %a3
>> 2274 dputc '\n'
>> 2275 movel %a2,%a0@
>> 2276
>> 2277 addl #PAGE_TABLE_SIZE*PAGESIZE,%a2
>> 2278 addl #PAGE_TABLE_SIZE*PAGESIZE,%a3
>> 2279
>> 2280 L(mmu_mapnext_030):
>> 2281 /* Ready with mapping?
>> 2282 */
>> 2283 lea %a3@(-1),%a0
>> 2284 cmpl %a0,%a4
>> 2285 jhi L(mmu_map_030)
>> 2286 jra L(mmu_map_done)
>> 2287
>> 2288 L(mmu_map_error):
>> 2289
>> 2290 dputs "mmu_map error:"
>> 2291 dputn %a2
>> 2292 dputn %a3
>> 2293 dputc '\n'
>> 2294
>> 2295 L(mmu_map_done):
>> 2296
>> 2297 func_return mmu_map
>> 2298
>> 2299 /*
>> 2300 * mmu_fixup
>> 2301 *
>> 2302 * On the 040 class machines, all pages that are used for the
>> 2303 * mmu have to be fixed up.
>> 2304 */
>> 2305
>> 2306 func_start mmu_fixup_page_mmu_cache,%d0/%a0
>> 2307
>> 2308 dputs "mmu_fixup_page_mmu_cache"
>> 2309 dputn ARG1
>> 2310
>> 2311 /* Calculate the offset into the root table
>> 2312 */
>> 2313 movel ARG1,%d0
>> 2314 moveq #ROOT_INDEX_SHIFT,%d1
>> 2315 lsrl %d1,%d0
>> 2316 mmu_get_root_table_entry %d0
>> 2317
>> 2318 /* Calculate the offset into the pointer table
>> 2319 */
>> 2320 movel ARG1,%d0
>> 2321 moveq #PTR_INDEX_SHIFT,%d1
>> 2322 lsrl %d1,%d0
>> 2323 andl #PTR_TABLE_SIZE-1,%d0
>> 2324 mmu_get_ptr_table_entry %a0,%d0
>> 2325
>> 2326 /* Calculate the offset into the page table
>> 2327 */
>> 2328 movel ARG1,%d0
>> 2329 moveq #PAGE_INDEX_SHIFT,%d1
>> 2330 lsrl %d1,%d0
>> 2331 andl #PAGE_TABLE_SIZE-1,%d0
>> 2332 mmu_get_page_table_entry %a0,%d0
>> 2333
>> 2334 movel %a0@,%d0
>> 2335 andil #_CACHEMASK040,%d0
>> 2336 orl %pc@(m68k_pgtable_cachemode),%d0
>> 2337 movel %d0,%a0@
>> 2338
>> 2339 dputc '\n'
>> 2340
>> 2341 func_return mmu_fixup_page_mmu_cache
>> 2342
>> 2343 /*
>> 2344 * mmu_temp_map
>> 2345 *
>> 2346 * create a temporary mapping to enable the mmu,
>> 2347 * this we don't need any transparation translation tricks.
>> 2348 */
>> 2349
>> 2350 func_start mmu_temp_map,%d0/%d1/%a0/%a1
>> 2351
>> 2352 dputs "mmu_temp_map"
>> 2353 dputn ARG1
>> 2354 dputn ARG2
>> 2355 dputc '\n'
>> 2356
>> 2357 lea %pc@(L(temp_mmap_mem)),%a1
>> 2358
>> 2359 /* Calculate the offset in the root table
>> 2360 */
>> 2361 movel ARG2,%d0
>> 2362 moveq #ROOT_INDEX_SHIFT,%d1
>> 2363 lsrl %d1,%d0
>> 2364 mmu_get_root_table_entry %d0
>> 2365
>> 2366 /* Check if the table is temporary allocated, so we have to reuse it
>> 2367 */
>> 2368 movel %a0@,%d0
>> 2369 cmpl %pc@(L(memory_start)),%d0
>> 2370 jcc 1f
>> 2371
>> 2372 /* Temporary allocate a ptr table and insert it into the root table
>> 2373 */
>> 2374 movel %a1@,%d0
>> 2375 addl #PTR_TABLE_SIZE*4,%a1@
>> 2376 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2377 movel %d0,%a0@
>> 2378 dputs " (new)"
>> 2379 1:
>> 2380 dputn %d0
>> 2381 /* Mask the root table entry for the ptr table
>> 2382 */
>> 2383 andw #-ROOT_TABLE_SIZE,%d0
>> 2384 movel %d0,%a0
>> 2385
>> 2386 /* Calculate the offset into the pointer table
>> 2387 */
>> 2388 movel ARG2,%d0
>> 2389 moveq #PTR_INDEX_SHIFT,%d1
>> 2390 lsrl %d1,%d0
>> 2391 andl #PTR_TABLE_SIZE-1,%d0
>> 2392 lea %a0@(%d0*4),%a0
>> 2393 dputn %a0
>> 2394
>> 2395 /* Check if a temporary page table is already allocated
>> 2396 */
>> 2397 movel %a0@,%d0
>> 2398 jne 1f
>> 2399
>> 2400 /* Temporary allocate a page table and insert it into the ptr table
>> 2401 */
>> 2402 movel %a1@,%d0
>> 2403 /* The 512 should be PAGE_TABLE_SIZE*4, but that violates the
>> 2404 alignment restriction for pointer tables on the '0[46]0. */
>> 2405 addl #512,%a1@
>> 2406 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2407 movel %d0,%a0@
>> 2408 dputs " (new)"
>> 2409 1:
>> 2410 dputn %d0
>> 2411 /* Mask the ptr table entry for the page table
>> 2412 */
>> 2413 andw #-PTR_TABLE_SIZE,%d0
>> 2414 movel %d0,%a0
>> 2415
>> 2416 /* Calculate the offset into the page table
>> 2417 */
>> 2418 movel ARG2,%d0
>> 2419 moveq #PAGE_INDEX_SHIFT,%d1
>> 2420 lsrl %d1,%d0
>> 2421 andl #PAGE_TABLE_SIZE-1,%d0
>> 2422 lea %a0@(%d0*4),%a0
>> 2423 dputn %a0
>> 2424
>> 2425 /* Insert the address into the page table
>> 2426 */
>> 2427 movel ARG1,%d0
>> 2428 andw #-PAGESIZE,%d0
>> 2429 orw #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0
>> 2430 movel %d0,%a0@
>> 2431 dputn %d0
>> 2432
>> 2433 dputc '\n'
>> 2434
>> 2435 func_return mmu_temp_map
>> 2436
>> 2437 func_start mmu_engage,%d0-%d2/%a0-%a3
>> 2438
>> 2439 moveq #ROOT_TABLE_SIZE-1,%d0
>> 2440 /* Temporarily use a different root table. */
>> 2441 lea %pc@(L(kernel_pgdir_ptr)),%a0
>> 2442 movel %a0@,%a2
>> 2443 movel %pc@(L(memory_start)),%a1
>> 2444 movel %a1,%a0@
>> 2445 movel %a2,%a0
>> 2446 1:
>> 2447 movel %a0@+,%a1@+
>> 2448 dbra %d0,1b
>> 2449
>> 2450 lea %pc@(L(temp_mmap_mem)),%a0
>> 2451 movel %a1,%a0@
>> 2452
>> 2453 movew #PAGESIZE-1,%d0
>> 2454 1:
>> 2455 clrl %a1@+
>> 2456 dbra %d0,1b
>> 2457
>> 2458 lea %pc@(1b),%a0
>> 2459 movel #1b,%a1
>> 2460 /* Skip temp mappings if phys == virt */
>> 2461 cmpl %a0,%a1
>> 2462 jeq 1f
>> 2463
>> 2464 mmu_temp_map %a0,%a0
>> 2465 mmu_temp_map %a0,%a1
>> 2466
>> 2467 addw #PAGESIZE,%a0
>> 2468 addw #PAGESIZE,%a1
>> 2469 mmu_temp_map %a0,%a0
>> 2470 mmu_temp_map %a0,%a1
>> 2471 1:
>> 2472 movel %pc@(L(memory_start)),%a3
>> 2473 movel %pc@(L(phys_kernel_start)),%d2
>> 2474
>> 2475 is_not_040_or_060(L(mmu_engage_030))
>> 2476
>> 2477 L(mmu_engage_040):
>> 2478 .chip 68040
>> 2479 nop
>> 2480 cinva %bc
>> 2481 nop
>> 2482 pflusha
>> 2483 nop
>> 2484 movec %a3,%srp
>> 2485 movel #TC_ENABLE+TC_PAGE4K,%d0
>> 2486 movec %d0,%tc /* enable the MMU */
>> 2487 jmp 1f:l
>> 2488 1: nop
>> 2489 movec %a2,%srp
>> 2490 nop
>> 2491 cinva %bc
>> 2492 nop
>> 2493 pflusha
>> 2494 .chip 68k
>> 2495 jra L(mmu_engage_cleanup)
>> 2496
>> 2497 L(mmu_engage_030_temp):
>> 2498 .space 12
>> 2499 L(mmu_engage_030):
>> 2500 .chip 68030
>> 2501 lea %pc@(L(mmu_engage_030_temp)),%a0
>> 2502 movel #0x80000002,%a0@
>> 2503 movel %a3,%a0@(4)
>> 2504 movel #0x0808,%d0
>> 2505 movec %d0,%cacr
>> 2506 pmove %a0@,%srp
>> 2507 pflusha
>> 2508 /*
>> 2509 * enable,super root enable,4096 byte pages,7 bit root index,
>> 2510 * 7 bit pointer index, 6 bit page table index.
>> 2511 */
>> 2512 movel #0x82c07760,%a0@(8)
>> 2513 pmove %a0@(8),%tc /* enable the MMU */
>> 2514 jmp 1f:l
>> 2515 1: movel %a2,%a0@(4)
>> 2516 movel #0x0808,%d0
>> 2517 movec %d0,%cacr
>> 2518 pmove %a0@,%srp
>> 2519 pflusha
>> 2520 .chip 68k
>> 2521
>> 2522 L(mmu_engage_cleanup):
>> 2523 subl #PAGE_OFFSET,%d2
>> 2524 subl %d2,%a2
>> 2525 movel %a2,L(kernel_pgdir_ptr)
>> 2526 subl %d2,%fp
>> 2527 subl %d2,%sp
>> 2528 subl %d2,ARG0
>> 2529
>> 2530 func_return mmu_engage
>> 2531
>> 2532 func_start mmu_get_root_table_entry,%d0/%a1
>> 2533
>> 2534 #if 0
>> 2535 dputs "mmu_get_root_table_entry:"
>> 2536 dputn ARG1
>> 2537 dputs " ="
>> 2538 #endif
>> 2539
>> 2540 movel %pc@(L(kernel_pgdir_ptr)),%a0
>> 2541 tstl %a0
>> 2542 jne 2f
>> 2543
>> 2544 dputs "\nmmu_init:"
>> 2545
>> 2546 /* Find the start of free memory, get_bi_record does this for us,
>> 2547 * as the bootinfo structure is located directly behind the kernel
>> 2548 * we simply search for the last entry.
>> 2549 */
>> 2550 get_bi_record BI_LAST
>> 2551 addw #PAGESIZE-1,%a0
>> 2552 movel %a0,%d0
>> 2553 andw #-PAGESIZE,%d0
>> 2554
>> 2555 dputn %d0
>> 2556
>> 2557 lea %pc@(L(memory_start)),%a0
>> 2558 movel %d0,%a0@
>> 2559 lea %pc@(L(kernel_end)),%a0
>> 2560 movel %d0,%a0@
>> 2561
>> 2562 /* we have to return the first page at _stext since the init code
>> 2563 * in mm/init.c simply expects kernel_pg_dir there, the rest of
>> 2564 * page is used for further ptr tables in get_ptr_table.
>> 2565 */
>> 2566 lea %pc@(_stext),%a0
>> 2567 lea %pc@(L(mmu_cached_pointer_tables)),%a1
>> 2568 movel %a0,%a1@
>> 2569 addl #ROOT_TABLE_SIZE*4,%a1@
>> 2570
>> 2571 lea %pc@(L(mmu_num_pointer_tables)),%a1
>> 2572 addql #1,%a1@
>> 2573
>> 2574 /* clear the page
>> 2575 */
>> 2576 movel %a0,%a1
>> 2577 movew #PAGESIZE/4-1,%d0
>> 2578 1:
>> 2579 clrl %a1@+
>> 2580 dbra %d0,1b
>> 2581
>> 2582 lea %pc@(L(kernel_pgdir_ptr)),%a1
>> 2583 movel %a0,%a1@
>> 2584
>> 2585 dputn %a0
>> 2586 dputc '\n'
>> 2587 2:
>> 2588 movel ARG1,%d0
>> 2589 lea %a0@(%d0*4),%a0
>> 2590
>> 2591 #if 0
>> 2592 dputn %a0
>> 2593 dputc '\n'
>> 2594 #endif
>> 2595
>> 2596 func_return mmu_get_root_table_entry
>> 2597
>> 2598
>> 2599
>> 2600 func_start mmu_get_ptr_table_entry,%d0/%a1
>> 2601
>> 2602 #if 0
>> 2603 dputs "mmu_get_ptr_table_entry:"
>> 2604 dputn ARG1
>> 2605 dputn ARG2
>> 2606 dputs " ="
>> 2607 #endif
>> 2608
>> 2609 movel ARG1,%a0
>> 2610 movel %a0@,%d0
>> 2611 jne 2f
>> 2612
>> 2613 /* Keep track of the number of pointer tables we use
>> 2614 */
>> 2615 dputs "\nmmu_get_new_ptr_table:"
>> 2616 lea %pc@(L(mmu_num_pointer_tables)),%a0
>> 2617 movel %a0@,%d0
>> 2618 addql #1,%a0@
>> 2619
>> 2620 /* See if there is a free pointer table in our cache of pointer tables
>> 2621 */
>> 2622 lea %pc@(L(mmu_cached_pointer_tables)),%a1
>> 2623 andw #7,%d0
>> 2624 jne 1f
>> 2625
>> 2626 /* Get a new pointer table page from above the kernel memory
>> 2627 */
>> 2628 get_new_page
>> 2629 movel %a0,%a1@
>> 2630 1:
>> 2631 /* There is an unused pointer table in our cache... use it
>> 2632 */
>> 2633 movel %a1@,%d0
>> 2634 addl #PTR_TABLE_SIZE*4,%a1@
>> 2635
>> 2636 dputn %d0
>> 2637 dputc '\n'
>> 2638
>> 2639 /* Insert the new pointer table into the root table
>> 2640 */
>> 2641 movel ARG1,%a0
>> 2642 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0
>> 2643 movel %d0,%a0@
>> 2644 2:
>> 2645 /* Extract the pointer table entry
>> 2646 */
>> 2647 andw #-PTR_TABLE_SIZE,%d0
>> 2648 movel %d0,%a0
>> 2649 movel ARG2,%d0
>> 2650 lea %a0@(%d0*4),%a0
>> 2651
>> 2652 #if 0
>> 2653 dputn %a0
>> 2654 dputc '\n'
>> 2655 #endif
>> 2656
>> 2657 func_return mmu_get_ptr_table_entry
>> 2658
>> 2659
>> 2660 func_start mmu_get_page_table_entry,%d0/%a1
>> 2661
>> 2662 #if 0
>> 2663 dputs "mmu_get_page_table_entry:"
>> 2664 dputn ARG1
>> 2665 dputn ARG2
>> 2666 dputs " ="
>> 2667 #endif
>> 2668
>> 2669 movel ARG1,%a0
>> 2670 movel %a0@,%d0
>> 2671 jne 2f
>> 2672
>> 2673 /* If the page table entry doesn't exist, we allocate a complete new
>> 2674 * page and use it as one continuous big page table which can cover
>> 2675 * 4MB of memory, nearly almost all mappings have that alignment.
>> 2676 */
>> 2677 get_new_page
>> 2678 addw #_PAGE_TABLE+_PAGE_ACCESSED,%a0
>> 2679
>> 2680 /* align pointer table entry for a page of page tables
>> 2681 */
>> 2682 movel ARG1,%d0
>> 2683 andw #-(PAGESIZE/PAGE_TABLE_SIZE),%d0
>> 2684 movel %d0,%a1
>> 2685
>> 2686 /* Insert the page tables into the pointer entries
>> 2687 */
>> 2688 moveq #PAGESIZE/PAGE_TABLE_SIZE/4-1,%d0
>> 2689 1:
>> 2690 movel %a0,%a1@+
>> 2691 lea %a0@(PAGE_TABLE_SIZE*4),%a0
>> 2692 dbra %d0,1b
>> 2693
>> 2694 /* Now we can get the initialized pointer table entry
>> 2695 */
>> 2696 movel ARG1,%a0
>> 2697 movel %a0@,%d0
>> 2698 2:
>> 2699 /* Extract the page table entry
>> 2700 */
>> 2701 andw #-PAGE_TABLE_SIZE,%d0
>> 2702 movel %d0,%a0
>> 2703 movel ARG2,%d0
>> 2704 lea %a0@(%d0*4),%a0
>> 2705
>> 2706 #if 0
>> 2707 dputn %a0
>> 2708 dputc '\n'
>> 2709 #endif
>> 2710
>> 2711 func_return mmu_get_page_table_entry
>> 2712
>> 2713 /*
>> 2714 * get_new_page
>> 2715 *
>> 2716 * Return a new page from the memory start and clear it.
>> 2717 */
>> 2718 func_start get_new_page,%d0/%a1
>> 2719
>> 2720 dputs "\nget_new_page:"
>> 2721
>> 2722 /* allocate the page and adjust memory_start
>> 2723 */
>> 2724 lea %pc@(L(memory_start)),%a0
>> 2725 movel %a0@,%a1
>> 2726 addl #PAGESIZE,%a0@
>> 2727
>> 2728 /* clear the new page
>> 2729 */
>> 2730 movel %a1,%a0
>> 2731 movew #PAGESIZE/4-1,%d0
>> 2732 1:
>> 2733 clrl %a1@+
>> 2734 dbra %d0,1b
>> 2735
>> 2736 dputn %a0
>> 2737 dputc '\n'
>> 2738
>> 2739 func_return get_new_page
>> 2740
>> 2741
>> 2742
>> 2743 /*
>> 2744 * Debug output support
>> 2745 * Atarians have a choice between the parallel port, the serial port
>> 2746 * from the MFP or a serial port of the SCC
>> 2747 */
>> 2748
>> 2749 #ifdef CONFIG_MAC
>> 2750 /* You may define either or both of these. */
>> 2751 #define MAC_USE_SCC_A /* Modem port */
>> 2752 #define MAC_USE_SCC_B /* Printer port */
>> 2753
>> 2754 #if defined(MAC_USE_SCC_A) || defined(MAC_USE_SCC_B)
>> 2755 /* Initialisation table for SCC with 3.6864 MHz PCLK */
>> 2756 L(scc_initable_mac):
>> 2757 .byte 4,0x44 /* x16, 1 stopbit, no parity */
>> 2758 .byte 3,0xc0 /* receiver: 8 bpc */
>> 2759 .byte 5,0xe2 /* transmitter: 8 bpc, assert dtr/rts */
>> 2760 .byte 10,0 /* NRZ */
>> 2761 .byte 11,0x50 /* use baud rate generator */
>> 2762 .byte 12,1,13,0 /* 38400 baud */
>> 2763 .byte 14,1 /* Baud rate generator enable */
>> 2764 .byte 3,0xc1 /* enable receiver */
>> 2765 .byte 5,0xea /* enable transmitter */
>> 2766 .byte -1
>> 2767 .even
>> 2768 #endif
>> 2769 #endif /* CONFIG_MAC */
>> 2770
>> 2771 #ifdef CONFIG_ATARI
>> 2772 /* #define USE_PRINTER */
>> 2773 /* #define USE_SCC_B */
>> 2774 /* #define USE_SCC_A */
>> 2775 #define USE_MFP
>> 2776
>> 2777 #if defined(USE_SCC_A) || defined(USE_SCC_B)
>> 2778 /* Initialisation table for SCC with 7.9872 MHz PCLK */
>> 2779 /* PCLK == 8.0539 gives baud == 9680.1 */
>> 2780 L(scc_initable_atari):
>> 2781 .byte 4,0x44 /* x16, 1 stopbit, no parity */
>> 2782 .byte 3,0xc0 /* receiver: 8 bpc */
>> 2783 .byte 5,0xe2 /* transmitter: 8 bpc, assert dtr/rts */
>> 2784 .byte 10,0 /* NRZ */
>> 2785 .byte 11,0x50 /* use baud rate generator */
>> 2786 .byte 12,24,13,0 /* 9600 baud */
>> 2787 .byte 14,2,14,3 /* use master clock for BRG, enable */
>> 2788 .byte 3,0xc1 /* enable receiver */
>> 2789 .byte 5,0xea /* enable transmitter */
>> 2790 .byte -1
>> 2791 .even
>> 2792 #endif
>> 2793
>> 2794 #ifdef USE_PRINTER
>> 2795
>> 2796 LPSG_SELECT = 0xff8800
>> 2797 LPSG_READ = 0xff8800
>> 2798 LPSG_WRITE = 0xff8802
>> 2799 LPSG_IO_A = 14
>> 2800 LPSG_IO_B = 15
>> 2801 LPSG_CONTROL = 7
>> 2802 LSTMFP_GPIP = 0xfffa01
>> 2803 LSTMFP_DDR = 0xfffa05
>> 2804 LSTMFP_IERB = 0xfffa09
>> 2805
>> 2806 #elif defined(USE_SCC_B)
>> 2807
>> 2808 LSCC_CTRL = 0xff8c85
>> 2809 LSCC_DATA = 0xff8c87
>> 2810
>> 2811 #elif defined(USE_SCC_A)
>> 2812
>> 2813 LSCC_CTRL = 0xff8c81
>> 2814 LSCC_DATA = 0xff8c83
>> 2815
>> 2816 #elif defined(USE_MFP)
>> 2817
>> 2818 LMFP_UCR = 0xfffa29
>> 2819 LMFP_TDCDR = 0xfffa1d
>> 2820 LMFP_TDDR = 0xfffa25
>> 2821 LMFP_TSR = 0xfffa2d
>> 2822 LMFP_UDR = 0xfffa2f
>> 2823
>> 2824 #endif
>> 2825 #endif /* CONFIG_ATARI */
>> 2826
>> 2827 /*
>> 2828 * Serial port output support.
>> 2829 */
>> 2830
>> 2831 /*
>> 2832 * Initialize serial port hardware
>> 2833 */
>> 2834 func_start serial_init,%d0/%d1/%a0/%a1
>> 2835 /*
>> 2836 * Some of the register usage that follows
>> 2837 * CONFIG_AMIGA
>> 2838 * a0 = pointer to boot info record
>> 2839 * d0 = boot info offset
>> 2840 * CONFIG_ATARI
>> 2841 * a0 = address of SCC
>> 2842 * a1 = Liobase address/address of scc_initable_atari
>> 2843 * d0 = init data for serial port
>> 2844 * CONFIG_MAC
>> 2845 * a0 = address of SCC
>> 2846 * a1 = address of scc_initable_mac
>> 2847 * d0 = init data for serial port
>> 2848 */
>> 2849
>> 2850 #ifdef CONFIG_AMIGA
>> 2851 #define SERIAL_DTR 7
>> 2852 #define SERIAL_CNTRL CIABBASE+C_PRA
>> 2853
>> 2854 is_not_amiga(1f)
>> 2855 lea %pc@(L(custom)),%a0
>> 2856 movel #-ZTWOBASE,%a0@
>> 2857 bclr #SERIAL_DTR,SERIAL_CNTRL-ZTWOBASE
>> 2858 get_bi_record BI_AMIGA_SERPER
>> 2859 movew %a0@,CUSTOMBASE+C_SERPER-ZTWOBASE
>> 2860 | movew #61,CUSTOMBASE+C_SERPER-ZTWOBASE
>> 2861 1:
>> 2862 #endif
>> 2863
>> 2864 #ifdef CONFIG_ATARI
>> 2865 is_not_atari(4f)
>> 2866 movel %pc@(L(iobase)),%a1
>> 2867 #if defined(USE_PRINTER)
>> 2868 bclr #0,%a1@(LSTMFP_IERB)
>> 2869 bclr #0,%a1@(LSTMFP_DDR)
>> 2870 moveb #LPSG_CONTROL,%a1@(LPSG_SELECT)
>> 2871 moveb #0xff,%a1@(LPSG_WRITE)
>> 2872 moveb #LPSG_IO_B,%a1@(LPSG_SELECT)
>> 2873 clrb %a1@(LPSG_WRITE)
>> 2874 moveb #LPSG_IO_A,%a1@(LPSG_SELECT)
>> 2875 moveb %a1@(LPSG_READ),%d0
>> 2876 bset #5,%d0
>> 2877 moveb %d0,%a1@(LPSG_WRITE)
>> 2878 #elif defined(USE_SCC_A) || defined(USE_SCC_B)
>> 2879 lea %a1@(LSCC_CTRL),%a0
>> 2880 /* Reset SCC register pointer */
>> 2881 moveb %a0@,%d0
>> 2882 /* Reset SCC device: write register pointer then register value */
>> 2883 moveb #9,%a0@
>> 2884 moveb #0xc0,%a0@
>> 2885 /* Wait for 5 PCLK cycles, which is about 63 CPU cycles */
>> 2886 /* 5 / 7.9872 MHz = approx. 0.63 us = 63 / 100 MHz */
>> 2887 movel #32,%d0
>> 2888 2:
>> 2889 subq #1,%d0
>> 2890 jne 2b
>> 2891 /* Initialize channel */
>> 2892 lea %pc@(L(scc_initable_atari)),%a1
>> 2893 2: moveb %a1@+,%d0
>> 2894 jmi 3f
>> 2895 moveb %d0,%a0@
>> 2896 moveb %a1@+,%a0@
>> 2897 jra 2b
>> 2898 3: clrb %a0@
>> 2899 #elif defined(USE_MFP)
>> 2900 bclr #1,%a1@(LMFP_TSR)
>> 2901 moveb #0x88,%a1@(LMFP_UCR)
>> 2902 andb #0x70,%a1@(LMFP_TDCDR)
>> 2903 moveb #2,%a1@(LMFP_TDDR)
>> 2904 orb #1,%a1@(LMFP_TDCDR)
>> 2905 bset #1,%a1@(LMFP_TSR)
>> 2906 #endif
>> 2907 jra L(serial_init_done)
>> 2908 4:
>> 2909 #endif
>> 2910
>> 2911 #ifdef CONFIG_MAC
>> 2912 is_not_mac(L(serial_init_not_mac))
>> 2913 #if defined(MAC_USE_SCC_A) || defined(MAC_USE_SCC_B)
>> 2914 #define mac_scc_cha_b_ctrl_offset 0x0
>> 2915 #define mac_scc_cha_a_ctrl_offset 0x2
>> 2916 #define mac_scc_cha_b_data_offset 0x4
>> 2917 #define mac_scc_cha_a_data_offset 0x6
>> 2918 movel %pc@(L(mac_sccbase)),%a0
>> 2919 /* Reset SCC register pointer */
>> 2920 moveb %a0@(mac_scc_cha_a_ctrl_offset),%d0
>> 2921 /* Reset SCC device: write register pointer then register value */
>> 2922 moveb #9,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2923 moveb #0xc0,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2924 /* Wait for 5 PCLK cycles, which is about 68 CPU cycles */
>> 2925 /* 5 / 3.6864 MHz = approx. 1.36 us = 68 / 50 MHz */
>> 2926 movel #35,%d0
>> 2927 5:
>> 2928 subq #1,%d0
>> 2929 jne 5b
>> 2930 #endif
>> 2931 #ifdef MAC_USE_SCC_A
>> 2932 /* Initialize channel A */
>> 2933 lea %pc@(L(scc_initable_mac)),%a1
>> 2934 5: moveb %a1@+,%d0
>> 2935 jmi 6f
>> 2936 moveb %d0,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2937 moveb %a1@+,%a0@(mac_scc_cha_a_ctrl_offset)
>> 2938 jra 5b
>> 2939 6:
>> 2940 #endif /* MAC_USE_SCC_A */
>> 2941 #ifdef MAC_USE_SCC_B
>> 2942 /* Initialize channel B */
>> 2943 lea %pc@(L(scc_initable_mac)),%a1
>> 2944 7: moveb %a1@+,%d0
>> 2945 jmi 8f
>> 2946 moveb %d0,%a0@(mac_scc_cha_b_ctrl_offset)
>> 2947 moveb %a1@+,%a0@(mac_scc_cha_b_ctrl_offset)
>> 2948 jra 7b
>> 2949 8:
>> 2950 #endif /* MAC_USE_SCC_B */
>> 2951 jra L(serial_init_done)
>> 2952 L(serial_init_not_mac):
>> 2953 #endif /* CONFIG_MAC */
>> 2954
>> 2955 #ifdef CONFIG_Q40
>> 2956 is_not_q40(2f)
>> 2957 /* debug output goes into SRAM, so we don't do it unless requested
>> 2958 - check for '%LX$' signature in SRAM */
>> 2959 lea %pc@(q40_mem_cptr),%a1
>> 2960 move.l #0xff020010,%a1@ /* must be inited - also used by debug=mem */
>> 2961 move.l #0xff020000,%a1
>> 2962 cmp.b #'%',%a1@
>> 2963 bne 2f /*nodbg*/
>> 2964 addq.w #4,%a1
>> 2965 cmp.b #'L',%a1@
>> 2966 bne 2f /*nodbg*/
>> 2967 addq.w #4,%a1
>> 2968 cmp.b #'X',%a1@
>> 2969 bne 2f /*nodbg*/
>> 2970 addq.w #4,%a1
>> 2971 cmp.b #'$',%a1@
>> 2972 bne 2f /*nodbg*/
>> 2973 /* signature OK */
>> 2974 lea %pc@(L(q40_do_debug)),%a1
>> 2975 tas %a1@
>> 2976 /*nodbg: q40_do_debug is 0 by default*/
>> 2977 2:
>> 2978 #endif
>> 2979
>> 2980 #ifdef CONFIG_MVME16x
>> 2981 is_not_mvme16x(L(serial_init_not_mvme16x))
>> 2982 moveb #0x10,M167_PCSCCMICR
>> 2983 moveb #0x10,M167_PCSCCTICR
>> 2984 moveb #0x10,M167_PCSCCRICR
>> 2985 jra L(serial_init_done)
>> 2986 L(serial_init_not_mvme16x):
>> 2987 #endif
>> 2988
>> 2989 #ifdef CONFIG_APOLLO
>> 2990 /* We count on the PROM initializing SIO1 */
>> 2991 #endif
>> 2992
>> 2993 #ifdef CONFIG_HP300
>> 2994 /* We count on the boot loader initialising the UART */
>> 2995 #endif
>> 2996
>> 2997 L(serial_init_done):
>> 2998 func_return serial_init
>> 2999
>> 3000 /*
>> 3001 * Output character on serial port.
>> 3002 */
>> 3003 func_start serial_putc,%d0/%d1/%a0/%a1
>> 3004
>> 3005 movel ARG1,%d0
>> 3006 cmpib #'\n',%d0
>> 3007 jbne 1f
>> 3008
>> 3009 /* A little safe recursion is good for the soul */
>> 3010 serial_putc #'\r'
>> 3011 1:
>> 3012
>> 3013 #ifdef CONFIG_AMIGA
>> 3014 is_not_amiga(2f)
>> 3015 andw #0x00ff,%d0
>> 3016 oriw #0x0100,%d0
>> 3017 movel %pc@(L(custom)),%a0
>> 3018 movew %d0,%a0@(CUSTOMBASE+C_SERDAT)
>> 3019 1: movew %a0@(CUSTOMBASE+C_SERDATR),%d0
>> 3020 andw #0x2000,%d0
>> 3021 jeq 1b
>> 3022 jra L(serial_putc_done)
>> 3023 2:
>> 3024 #endif
>> 3025
>> 3026 #ifdef CONFIG_MAC
>> 3027 is_not_mac(5f)
>> 3028 #if defined(MAC_USE_SCC_A) || defined(MAC_USE_SCC_B)
>> 3029 movel %pc@(L(mac_sccbase)),%a1
>> 3030 #endif
>> 3031 #ifdef MAC_USE_SCC_A
>> 3032 3: btst #2,%a1@(mac_scc_cha_a_ctrl_offset)
>> 3033 jeq 3b
>> 3034 moveb %d0,%a1@(mac_scc_cha_a_data_offset)
>> 3035 #endif /* MAC_USE_SCC_A */
>> 3036 #ifdef MAC_USE_SCC_B
>> 3037 4: btst #2,%a1@(mac_scc_cha_b_ctrl_offset)
>> 3038 jeq 4b
>> 3039 moveb %d0,%a1@(mac_scc_cha_b_data_offset)
>> 3040 #endif /* MAC_USE_SCC_B */
>> 3041 jra L(serial_putc_done)
>> 3042 5:
>> 3043 #endif /* CONFIG_MAC */
>> 3044
>> 3045 #ifdef CONFIG_ATARI
>> 3046 is_not_atari(4f)
>> 3047 movel %pc@(L(iobase)),%a1
>> 3048 #if defined(USE_PRINTER)
>> 3049 3: btst #0,%a1@(LSTMFP_GPIP)
>> 3050 jne 3b
>> 3051 moveb #LPSG_IO_B,%a1@(LPSG_SELECT)
>> 3052 moveb %d0,%a1@(LPSG_WRITE)
>> 3053 moveb #LPSG_IO_A,%a1@(LPSG_SELECT)
>> 3054 moveb %a1@(LPSG_READ),%d0
>> 3055 bclr #5,%d0
>> 3056 moveb %d0,%a1@(LPSG_WRITE)
>> 3057 nop
>> 3058 nop
>> 3059 bset #5,%d0
>> 3060 moveb %d0,%a1@(LPSG_WRITE)
>> 3061 #elif defined(USE_SCC_A) || defined(USE_SCC_B)
>> 3062 3: btst #2,%a1@(LSCC_CTRL)
>> 3063 jeq 3b
>> 3064 moveb %d0,%a1@(LSCC_DATA)
>> 3065 #elif defined(USE_MFP)
>> 3066 3: btst #7,%a1@(LMFP_TSR)
>> 3067 jeq 3b
>> 3068 moveb %d0,%a1@(LMFP_UDR)
>> 3069 #endif
>> 3070 jra L(serial_putc_done)
>> 3071 4:
>> 3072 #endif /* CONFIG_ATARI */
>> 3073
>> 3074 #ifdef CONFIG_MVME147
>> 3075 is_not_mvme147(2f)
>> 3076 1: btst #2,M147_SCC_CTRL_A
>> 3077 jeq 1b
>> 3078 moveb %d0,M147_SCC_DATA_A
>> 3079 jbra L(serial_putc_done)
>> 3080 2:
>> 3081 #endif
>> 3082
>> 3083 #ifdef CONFIG_MVME16x
>> 3084 is_not_mvme16x(2f)
>> 3085 /*
>> 3086 * If the loader gave us a board type then we can use that to
>> 3087 * select an appropriate output routine; otherwise we just use
>> 3088 * the Bug code. If we have to use the Bug that means the Bug
>> 3089 * workspace has to be valid, which means the Bug has to use
>> 3090 * the SRAM, which is non-standard.
>> 3091 */
>> 3092 moveml %d0-%d7/%a2-%a6,%sp@-
>> 3093 movel vme_brdtype,%d1
>> 3094 jeq 1f | No tag - use the Bug
>> 3095 cmpi #VME_TYPE_MVME162,%d1
>> 3096 jeq 6f
>> 3097 cmpi #VME_TYPE_MVME172,%d1
>> 3098 jne 5f
>> 3099 /* 162/172; it's an SCC */
>> 3100 6: btst #2,M162_SCC_CTRL_A
>> 3101 nop
>> 3102 nop
>> 3103 nop
>> 3104 jeq 6b
>> 3105 moveb #8,M162_SCC_CTRL_A
>> 3106 nop
>> 3107 nop
>> 3108 nop
>> 3109 moveb %d0,M162_SCC_CTRL_A
>> 3110 jra 3f
>> 3111 5:
>> 3112 /* 166/167/177; it's a CD2401 */
>> 3113 moveb #0,M167_CYCAR
>> 3114 moveb M167_CYIER,%d2
>> 3115 moveb #0x02,M167_CYIER
>> 3116 7:
>> 3117 btst #5,M167_PCSCCTICR
>> 3118 jeq 7b
>> 3119 moveb M167_PCTPIACKR,%d1
>> 3120 moveb M167_CYLICR,%d1
>> 3121 jeq 8f
>> 3122 moveb #0x08,M167_CYTEOIR
>> 3123 jra 7b
>> 3124 8:
>> 3125 moveb %d0,M167_CYTDR
>> 3126 moveb #0,M167_CYTEOIR
>> 3127 moveb %d2,M167_CYIER
>> 3128 jra 3f
>> 3129 1:
>> 3130 moveb %d0,%sp@-
>> 3131 trap #15
>> 3132 .word 0x0020 /* TRAP 0x020 */
>> 3133 3:
>> 3134 moveml %sp@+,%d0-%d7/%a2-%a6
>> 3135 jbra L(serial_putc_done)
>> 3136 2:
>> 3137 #endif /* CONFIG_MVME16x */
>> 3138
>> 3139 #ifdef CONFIG_BVME6000
>> 3140 is_not_bvme6000(2f)
>> 3141 /*
>> 3142 * The BVME6000 machine has a serial port ...
>> 3143 */
>> 3144 1: btst #2,BVME_SCC_CTRL_A
>> 3145 jeq 1b
>> 3146 moveb %d0,BVME_SCC_DATA_A
>> 3147 jbra L(serial_putc_done)
>> 3148 2:
>> 3149 #endif
>> 3150
>> 3151 #ifdef CONFIG_SUN3X
>> 3152 is_not_sun3x(2f)
>> 3153 movel %d0,-(%sp)
>> 3154 movel 0xFEFE0018,%a1
>> 3155 jbsr (%a1)
>> 3156 addq #4,%sp
>> 3157 jbra L(serial_putc_done)
>> 3158 2:
>> 3159 #endif
>> 3160
>> 3161 #ifdef CONFIG_Q40
>> 3162 is_not_q40(2f)
>> 3163 tst.l %pc@(L(q40_do_debug)) /* only debug if requested */
>> 3164 beq 2f
>> 3165 lea %pc@(q40_mem_cptr),%a1
>> 3166 move.l %a1@,%a0
>> 3167 move.b %d0,%a0@
>> 3168 addq.l #4,%a0
>> 3169 move.l %a0,%a1@
>> 3170 jbra L(serial_putc_done)
>> 3171 2:
>> 3172 #endif
>> 3173
>> 3174 #ifdef CONFIG_APOLLO
>> 3175 is_not_apollo(2f)
>> 3176 movl %pc@(L(iobase)),%a1
>> 3177 moveb %d0,%a1@(LTHRB0)
>> 3178 1: moveb %a1@(LSRB0),%d0
>> 3179 andb #0x4,%d0
>> 3180 beq 1b
>> 3181 jbra L(serial_putc_done)
>> 3182 2:
>> 3183 #endif
>> 3184
>> 3185 #ifdef CONFIG_HP300
>> 3186 is_not_hp300(3f)
>> 3187 movl %pc@(L(iobase)),%a1
>> 3188 addl %pc@(L(uartbase)),%a1
>> 3189 movel %pc@(L(uart_scode)),%d1 /* Check the scode */
>> 3190 jmi 3f /* Unset? Exit */
>> 3191 cmpi #256,%d1 /* APCI scode? */
>> 3192 jeq 2f
>> 3193 1: moveb %a1@(DCALSR),%d1 /* Output to DCA */
>> 3194 andb #0x20,%d1
>> 3195 beq 1b
>> 3196 moveb %d0,%a1@(DCADATA)
>> 3197 jbra L(serial_putc_done)
>> 3198 2: moveb %a1@(APCILSR),%d1 /* Output to APCI */
>> 3199 andb #0x20,%d1
>> 3200 beq 2b
>> 3201 moveb %d0,%a1@(APCIDATA)
>> 3202 jbra L(serial_putc_done)
>> 3203 3:
>> 3204 #endif
>> 3205
>> 3206 #ifdef CONFIG_VIRT
>> 3207 is_not_virt(1f)
>> 3208
>> 3209 movel L(virt_gf_tty_base),%a1
>> 3210 movel %d0,%a1@(GF_PUT_CHAR)
>> 3211 1:
>> 3212 #endif
>> 3213
>> 3214 L(serial_putc_done):
>> 3215 func_return serial_putc
>> 3216
>> 3217 /*
>> 3218 * Output a string.
>> 3219 */
>> 3220 func_start puts,%d0/%a0
>> 3221
>> 3222 movel ARG1,%a0
>> 3223 jra 2f
>> 3224 1:
>> 3225 #ifdef CONSOLE_DEBUG
>> 3226 console_putc %d0
>> 3227 #endif
>> 3228 #ifdef SERIAL_DEBUG
>> 3229 serial_putc %d0
>> 3230 #endif
>> 3231 2: moveb %a0@+,%d0
>> 3232 jne 1b
>> 3233
>> 3234 func_return puts
>> 3235
>> 3236 /*
>> 3237 * Output number in hex notation.
>> 3238 */
>> 3239
>> 3240 func_start putn,%d0-%d2
>> 3241
>> 3242 putc ' '
>> 3243
>> 3244 movel ARG1,%d0
>> 3245 moveq #7,%d1
>> 3246 1: roll #4,%d0
>> 3247 move %d0,%d2
>> 3248 andb #0x0f,%d2
>> 3249 addb #'0',%d2
>> 3250 cmpb #'9',%d2
>> 3251 jls 2f
>> 3252 addb #'A'-('9'+1),%d2
>> 3253 2:
>> 3254 #ifdef CONSOLE_DEBUG
>> 3255 console_putc %d2
>> 3256 #endif
>> 3257 #ifdef SERIAL_DEBUG
>> 3258 serial_putc %d2
>> 3259 #endif
>> 3260 dbra %d1,1b
>> 3261
>> 3262 func_return putn
>> 3263
>> 3264 #ifdef CONFIG_EARLY_PRINTK
>> 3265 /*
>> 3266 * This routine takes its parameters on the stack. It then
>> 3267 * turns around and calls the internal routines. This routine
>> 3268 * is used by the boot console.
>> 3269 *
>> 3270 * The calling parameters are:
>> 3271 * void debug_cons_nputs(const char *str, unsigned length)
>> 3272 *
>> 3273 * This routine does NOT understand variable arguments only
>> 3274 * simple strings!
>> 3275 */
>> 3276 ENTRY(debug_cons_nputs)
>> 3277 moveml %d0/%d1/%a0,%sp@-
>> 3278 movew %sr,%sp@-
>> 3279 ori #0x0700,%sr
>> 3280 movel %sp@(18),%a0 /* fetch parameter */
>> 3281 movel %sp@(22),%d1 /* fetch parameter */
>> 3282 jra 2f
>> 3283 1:
>> 3284 #ifdef CONSOLE_DEBUG
>> 3285 console_putc %d0
>> 3286 #endif
>> 3287 #ifdef SERIAL_DEBUG
>> 3288 serial_putc %d0
>> 3289 #endif
>> 3290 subq #1,%d1
>> 3291 2: jeq 3f
>> 3292 moveb %a0@+,%d0
>> 3293 jne 1b
>> 3294 3:
>> 3295 movew %sp@+,%sr
>> 3296 moveml %sp@+,%d0/%d1/%a0
>> 3297 rts
>> 3298 #endif /* CONFIG_EARLY_PRINTK */
>> 3299
>> 3300 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 3301 func_start set_leds,%d0/%a0
>> 3302 movel ARG1,%d0
>> 3303 #ifdef CONFIG_HP300
>> 3304 is_not_hp300(1f)
>> 3305 movel %pc@(L(iobase)),%a0
>> 3306 moveb %d0,%a0@(0x1ffff)
>> 3307 jra 2f
>> 3308 #endif
>> 3309 1:
>> 3310 #ifdef CONFIG_APOLLO
>> 3311 movel %pc@(L(iobase)),%a0
>> 3312 lsll #8,%d0
>> 3313 eorw #0xff00,%d0
>> 3314 moveb %d0,%a0@(LCPUCTRL)
>> 3315 #endif
>> 3316 2:
>> 3317 func_return set_leds
>> 3318 #endif
>> 3319
>> 3320 #ifdef CONSOLE_DEBUG
>> 3321 /*
>> 3322 * For continuity, see the data alignment
>> 3323 * to which this structure is tied.
>> 3324 */
>> 3325 #define Lconsole_struct_cur_column 0
>> 3326 #define Lconsole_struct_cur_row 4
>> 3327 #define Lconsole_struct_num_columns 8
>> 3328 #define Lconsole_struct_num_rows 12
>> 3329 #define Lconsole_struct_left_edge 16
>> 3330
>> 3331 func_start console_init,%a0-%a4/%d0-%d7
>> 3332 /*
>> 3333 * Some of the register usage that follows
>> 3334 * a0 = pointer to boot_info
>> 3335 * a1 = pointer to screen
>> 3336 * a2 = pointer to console_globals
>> 3337 * d3 = pixel width of screen
>> 3338 * d4 = pixel height of screen
>> 3339 * (d3,d4) ~= (x,y) of a point just below
>> 3340 * and to the right of the screen
>> 3341 * NOT on the screen!
>> 3342 * d5 = number of bytes per scan line
>> 3343 * d6 = number of bytes on the entire screen
>> 3344 */
>> 3345
>> 3346 lea %pc@(L(console_globals)),%a2
>> 3347 movel %pc@(L(mac_videobase)),%a1
>> 3348 movel %pc@(L(mac_rowbytes)),%d5
>> 3349 movel %pc@(L(mac_dimensions)),%d3 /* -> low byte */
>> 3350 movel %d3,%d4
>> 3351 swap %d4 /* -> high byte */
>> 3352 andl #0xffff,%d3 /* d3 = screen width in pixels */
>> 3353 andl #0xffff,%d4 /* d4 = screen height in pixels */
>> 3354
>> 3355 movel %d5,%d6
>> 3356 | subl #20,%d6
>> 3357 mulul %d4,%d6 /* scan line bytes x num scan lines */
>> 3358 divul #8,%d6 /* we'll clear 8 bytes at a time */
>> 3359 moveq #-1,%d0 /* Mac_black */
>> 3360 subq #1,%d6
>> 3361
>> 3362 L(console_clear_loop):
>> 3363 movel %d0,%a1@+
>> 3364 movel %d0,%a1@+
>> 3365 dbra %d6,L(console_clear_loop)
>> 3366
>> 3367 /* Calculate font size */
>> 3368
>> 3369 #if defined(FONT_8x8) && defined(CONFIG_FONT_8x8)
>> 3370 lea %pc@(font_vga_8x8),%a0
>> 3371 #elif defined(FONT_8x16) && defined(CONFIG_FONT_8x16)
>> 3372 lea %pc@(font_vga_8x16),%a0
>> 3373 #elif defined(FONT_6x11) && defined(CONFIG_FONT_6x11)
>> 3374 lea %pc@(font_vga_6x11),%a0
>> 3375 #elif defined(CONFIG_FONT_8x8) /* default */
>> 3376 lea %pc@(font_vga_8x8),%a0
>> 3377 #else /* no compiled-in font */
>> 3378 lea 0,%a0
>> 3379 #endif
>> 3380
>> 3381 /*
>> 3382 * At this point we make a shift in register usage
>> 3383 * a1 = address of console_font pointer
>> 3384 */
>> 3385 lea %pc@(L(console_font)),%a1
>> 3386 movel %a0,%a1@ /* store pointer to struct fbcon_font_desc in console_font */
>> 3387 tstl %a0
>> 3388 jeq 1f
>> 3389 lea %pc@(L(console_font_data)),%a4
>> 3390 movel %a0@(FONT_DESC_DATA),%d0
>> 3391 subl #L(console_font),%a1
>> 3392 addl %a1,%d0
>> 3393 movel %d0,%a4@
>> 3394
>> 3395 /*
>> 3396 * Calculate global maxs
>> 3397 * Note - we can use either an
>> 3398 * 8 x 16 or 8 x 8 character font
>> 3399 * 6 x 11 also supported
>> 3400 */
>> 3401 /* ASSERT: a0 = contents of Lconsole_font */
>> 3402 movel %d3,%d0 /* screen width in pixels */
>> 3403 divul %a0@(FONT_DESC_WIDTH),%d0 /* d0 = max num chars per row */
>> 3404
>> 3405 movel %d4,%d1 /* screen height in pixels */
>> 3406 divul %a0@(FONT_DESC_HEIGHT),%d1 /* d1 = max num rows */
>> 3407
>> 3408 movel %d0,%a2@(Lconsole_struct_num_columns)
>> 3409 movel %d1,%a2@(Lconsole_struct_num_rows)
>> 3410
>> 3411 /*
>> 3412 * Clear the current row and column
>> 3413 */
>> 3414 clrl %a2@(Lconsole_struct_cur_column)
>> 3415 clrl %a2@(Lconsole_struct_cur_row)
>> 3416 clrl %a2@(Lconsole_struct_left_edge)
>> 3417
>> 3418 /*
>> 3419 * Initialization is complete
>> 3420 */
>> 3421 1:
>> 3422 func_return console_init
>> 3423
>> 3424 #ifdef CONFIG_LOGO
>> 3425 func_start console_put_penguin,%a0-%a1/%d0-%d7
>> 3426 /*
>> 3427 * Get 'that_penguin' onto the screen in the upper right corner
>> 3428 * penguin is 64 x 74 pixels, align against right edge of screen
>> 3429 */
>> 3430 lea %pc@(L(mac_dimensions)),%a0
>> 3431 movel %a0@,%d0
>> 3432 andil #0xffff,%d0
>> 3433 subil #64,%d0 /* snug up against the right edge */
>> 3434 clrl %d1 /* start at the top */
>> 3435 movel #73,%d7
>> 3436 lea %pc@(L(that_penguin)),%a1
>> 3437 L(console_penguin_row):
>> 3438 movel #31,%d6
>> 3439 L(console_penguin_pixel_pair):
>> 3440 moveb %a1@,%d2
>> 3441 lsrb #4,%d2
>> 3442 console_plot_pixel %d0,%d1,%d2
>> 3443 addq #1,%d0
>> 3444 moveb %a1@+,%d2
>> 3445 console_plot_pixel %d0,%d1,%d2
>> 3446 addq #1,%d0
>> 3447 dbra %d6,L(console_penguin_pixel_pair)
>> 3448
>> 3449 subil #64,%d0
>> 3450 addq #1,%d1
>> 3451 dbra %d7,L(console_penguin_row)
>> 3452
>> 3453 func_return console_put_penguin
>> 3454
>> 3455 /* include penguin bitmap */
>> 3456 L(that_penguin):
>> 3457 #include "../mac/mac_penguin.S"
>> 3458 #endif
>> 3459
>> 3460 /*
>> 3461 * Calculate source and destination addresses
>> 3462 * output a1 = dest
>> 3463 * a2 = source
>> 3464 */
>> 3465
>> 3466 func_start console_scroll,%a0-%a4/%d0-%d7
>> 3467 lea %pc@(L(mac_videobase)),%a0
>> 3468 movel %a0@,%a1
>> 3469 movel %a1,%a2
>> 3470 lea %pc@(L(mac_rowbytes)),%a0
>> 3471 movel %a0@,%d5
>> 3472 movel %pc@(L(console_font)),%a0
>> 3473 tstl %a0
>> 3474 jeq 1f
>> 3475 mulul %a0@(FONT_DESC_HEIGHT),%d5 /* account for # scan lines per character */
>> 3476 addal %d5,%a2
>> 3477
>> 3478 /*
>> 3479 * Get dimensions
>> 3480 */
>> 3481 lea %pc@(L(mac_dimensions)),%a0
>> 3482 movel %a0@,%d3
>> 3483 movel %d3,%d4
>> 3484 swap %d4
>> 3485 andl #0xffff,%d3 /* d3 = screen width in pixels */
>> 3486 andl #0xffff,%d4 /* d4 = screen height in pixels */
>> 3487
>> 3488 /*
>> 3489 * Calculate number of bytes to move
>> 3490 */
>> 3491 lea %pc@(L(mac_rowbytes)),%a0
>> 3492 movel %a0@,%d6
>> 3493 movel %pc@(L(console_font)),%a0
>> 3494 subl %a0@(FONT_DESC_HEIGHT),%d4 /* we're not scrolling the top row! */
>> 3495 mulul %d4,%d6 /* scan line bytes x num scan lines */
>> 3496 divul #32,%d6 /* we'll move 8 longs at a time */
>> 3497 subq #1,%d6
>> 3498
>> 3499 L(console_scroll_loop):
>> 3500 movel %a2@+,%a1@+
>> 3501 movel %a2@+,%a1@+
>> 3502 movel %a2@+,%a1@+
>> 3503 movel %a2@+,%a1@+
>> 3504 movel %a2@+,%a1@+
>> 3505 movel %a2@+,%a1@+
>> 3506 movel %a2@+,%a1@+
>> 3507 movel %a2@+,%a1@+
>> 3508 dbra %d6,L(console_scroll_loop)
>> 3509
>> 3510 lea %pc@(L(mac_rowbytes)),%a0
>> 3511 movel %a0@,%d6
>> 3512 movel %pc@(L(console_font)),%a0
>> 3513 mulul %a0@(FONT_DESC_HEIGHT),%d6 /* scan line bytes x font height */
>> 3514 divul #32,%d6 /* we'll move 8 words at a time */
>> 3515 subq #1,%d6
>> 3516
>> 3517 moveq #-1,%d0
>> 3518 L(console_scroll_clear_loop):
>> 3519 movel %d0,%a1@+
>> 3520 movel %d0,%a1@+
>> 3521 movel %d0,%a1@+
>> 3522 movel %d0,%a1@+
>> 3523 movel %d0,%a1@+
>> 3524 movel %d0,%a1@+
>> 3525 movel %d0,%a1@+
>> 3526 movel %d0,%a1@+
>> 3527 dbra %d6,L(console_scroll_clear_loop)
>> 3528
>> 3529 1:
>> 3530 func_return console_scroll
>> 3531
>> 3532
>> 3533 func_start console_putc,%a0/%a1/%d0-%d7
>> 3534
>> 3535 is_not_mac(L(console_exit))
>> 3536 tstl %pc@(L(console_font))
>> 3537 jeq L(console_exit)
>> 3538
>> 3539 /* Output character in d7 on console.
>> 3540 */
>> 3541 movel ARG1,%d7
>> 3542 cmpib #'\n',%d7
>> 3543 jbne 1f
>> 3544
>> 3545 /* A little safe recursion is good for the soul */
>> 3546 console_putc #'\r'
>> 3547 1:
>> 3548 lea %pc@(L(console_globals)),%a0
>> 3549
>> 3550 cmpib #10,%d7
>> 3551 jne L(console_not_lf)
>> 3552 movel %a0@(Lconsole_struct_cur_row),%d0
>> 3553 addil #1,%d0
>> 3554 movel %d0,%a0@(Lconsole_struct_cur_row)
>> 3555 movel %a0@(Lconsole_struct_num_rows),%d1
>> 3556 cmpl %d1,%d0
>> 3557 jcs 1f
>> 3558 subil #1,%d0
>> 3559 movel %d0,%a0@(Lconsole_struct_cur_row)
>> 3560 console_scroll
>> 3561 1:
>> 3562 jra L(console_exit)
>> 3563
>> 3564 L(console_not_lf):
>> 3565 cmpib #13,%d7
>> 3566 jne L(console_not_cr)
>> 3567 clrl %a0@(Lconsole_struct_cur_column)
>> 3568 jra L(console_exit)
>> 3569
>> 3570 L(console_not_cr):
>> 3571 cmpib #1,%d7
>> 3572 jne L(console_not_home)
>> 3573 clrl %a0@(Lconsole_struct_cur_row)
>> 3574 clrl %a0@(Lconsole_struct_cur_column)
>> 3575 jra L(console_exit)
>> 3576
>> 3577 /*
>> 3578 * At this point we know that the %d7 character is going to be
>> 3579 * rendered on the screen. Register usage is -
>> 3580 * a0 = pointer to console globals
>> 3581 * a1 = font data
>> 3582 * d0 = cursor column
>> 3583 * d1 = cursor row to draw the character
>> 3584 * d7 = character number
>> 3585 */
>> 3586 L(console_not_home):
>> 3587 movel %a0@(Lconsole_struct_cur_column),%d0
>> 3588 addql #1,%a0@(Lconsole_struct_cur_column)
>> 3589 movel %a0@(Lconsole_struct_num_columns),%d1
>> 3590 cmpl %d1,%d0
>> 3591 jcs 1f
>> 3592 console_putc #'\n' /* recursion is OK! */
>> 3593 1:
>> 3594 movel %a0@(Lconsole_struct_cur_row),%d1
>> 3595
>> 3596 /*
>> 3597 * At this point we make a shift in register usage
>> 3598 * a0 = address of pointer to font data (fbcon_font_desc)
>> 3599 */
>> 3600 movel %pc@(L(console_font)),%a0
>> 3601 movel %pc@(L(console_font_data)),%a1 /* Load fbcon_font_desc.data into a1 */
>> 3602 andl #0x000000ff,%d7
>> 3603 /* ASSERT: a0 = contents of Lconsole_font */
>> 3604 mulul %a0@(FONT_DESC_HEIGHT),%d7 /* d7 = index into font data */
>> 3605 addl %d7,%a1 /* a1 = points to char image */
>> 3606
>> 3607 /*
>> 3608 * At this point we make a shift in register usage
>> 3609 * d0 = pixel coordinate, x
>> 3610 * d1 = pixel coordinate, y
>> 3611 * d2 = (bit 0) 1/0 for white/black (!) pixel on screen
>> 3612 * d3 = font scan line data (8 pixels)
>> 3613 * d6 = count down for the font's pixel width (8)
>> 3614 * d7 = count down for the font's pixel count in height
>> 3615 */
>> 3616 /* ASSERT: a0 = contents of Lconsole_font */
>> 3617 mulul %a0@(FONT_DESC_WIDTH),%d0
>> 3618 mulul %a0@(FONT_DESC_HEIGHT),%d1
>> 3619 movel %a0@(FONT_DESC_HEIGHT),%d7 /* Load fbcon_font_desc.height into d7 */
>> 3620 subq #1,%d7
>> 3621 L(console_read_char_scanline):
>> 3622 moveb %a1@+,%d3
>> 3623
>> 3624 /* ASSERT: a0 = contents of Lconsole_font */
>> 3625 movel %a0@(FONT_DESC_WIDTH),%d6 /* Load fbcon_font_desc.width into d6 */
>> 3626 subql #1,%d6
>> 3627
>> 3628 L(console_do_font_scanline):
>> 3629 lslb #1,%d3
>> 3630 scsb %d2 /* convert 1 bit into a byte */
>> 3631 console_plot_pixel %d0,%d1,%d2
>> 3632 addq #1,%d0
>> 3633 dbra %d6,L(console_do_font_scanline)
>> 3634
>> 3635 /* ASSERT: a0 = contents of Lconsole_font */
>> 3636 subl %a0@(FONT_DESC_WIDTH),%d0
>> 3637 addq #1,%d1
>> 3638 dbra %d7,L(console_read_char_scanline)
>> 3639
>> 3640 L(console_exit):
>> 3641 func_return console_putc
>> 3642
>> 3643 /*
>> 3644 * Input:
>> 3645 * d0 = x coordinate
>> 3646 * d1 = y coordinate
>> 3647 * d2 = (bit 0) 1/0 for white/black (!)
>> 3648 * All registers are preserved
>> 3649 */
>> 3650 func_start console_plot_pixel,%a0-%a1/%d0-%d4
>> 3651
>> 3652 movel %pc@(L(mac_videobase)),%a1
>> 3653 movel %pc@(L(mac_videodepth)),%d3
>> 3654 movel ARG1,%d0
>> 3655 movel ARG2,%d1
>> 3656 mulul %pc@(L(mac_rowbytes)),%d1
>> 3657 movel ARG3,%d2
>> 3658
>> 3659 /*
>> 3660 * Register usage:
>> 3661 * d0 = x coord becomes byte offset into frame buffer
>> 3662 * d1 = y coord
>> 3663 * d2 = black or white (0/1)
>> 3664 * d3 = video depth
>> 3665 * d4 = temp of x (d0) for many bit depths
>> 3666 */
>> 3667 L(test_1bit):
>> 3668 cmpb #1,%d3
>> 3669 jbne L(test_2bit)
>> 3670 movel %d0,%d4 /* we need the low order 3 bits! */
>> 3671 divul #8,%d0
>> 3672 addal %d0,%a1
>> 3673 addal %d1,%a1
>> 3674 andb #7,%d4
>> 3675 eorb #7,%d4 /* reverse the x-coordinate w/ screen-bit # */
>> 3676 andb #1,%d2
>> 3677 jbne L(white_1)
>> 3678 bsetb %d4,%a1@
>> 3679 jbra L(console_plot_pixel_exit)
>> 3680 L(white_1):
>> 3681 bclrb %d4,%a1@
>> 3682 jbra L(console_plot_pixel_exit)
>> 3683
>> 3684 L(test_2bit):
>> 3685 cmpb #2,%d3
>> 3686 jbne L(test_4bit)
>> 3687 movel %d0,%d4 /* we need the low order 2 bits! */
>> 3688 divul #4,%d0
>> 3689 addal %d0,%a1
>> 3690 addal %d1,%a1
>> 3691 andb #3,%d4
>> 3692 eorb #3,%d4 /* reverse the x-coordinate w/ screen-bit # */
>> 3693 lsll #1,%d4 /* ! */
>> 3694 andb #1,%d2
>> 3695 jbne L(white_2)
>> 3696 bsetb %d4,%a1@
>> 3697 addq #1,%d4
>> 3698 bsetb %d4,%a1@
>> 3699 jbra L(console_plot_pixel_exit)
>> 3700 L(white_2):
>> 3701 bclrb %d4,%a1@
>> 3702 addq #1,%d4
>> 3703 bclrb %d4,%a1@
>> 3704 jbra L(console_plot_pixel_exit)
>> 3705
>> 3706 L(test_4bit):
>> 3707 cmpb #4,%d3
>> 3708 jbne L(test_8bit)
>> 3709 movel %d0,%d4 /* we need the low order bit! */
>> 3710 divul #2,%d0
>> 3711 addal %d0,%a1
>> 3712 addal %d1,%a1
>> 3713 andb #1,%d4
>> 3714 eorb #1,%d4
>> 3715 lsll #2,%d4 /* ! */
>> 3716 andb #1,%d2
>> 3717 jbne L(white_4)
>> 3718 bsetb %d4,%a1@
>> 3719 addq #1,%d4
>> 3720 bsetb %d4,%a1@
>> 3721 addq #1,%d4
>> 3722 bsetb %d4,%a1@
>> 3723 addq #1,%d4
>> 3724 bsetb %d4,%a1@
>> 3725 jbra L(console_plot_pixel_exit)
>> 3726 L(white_4):
>> 3727 bclrb %d4,%a1@
>> 3728 addq #1,%d4
>> 3729 bclrb %d4,%a1@
>> 3730 addq #1,%d4
>> 3731 bclrb %d4,%a1@
>> 3732 addq #1,%d4
>> 3733 bclrb %d4,%a1@
>> 3734 jbra L(console_plot_pixel_exit)
>> 3735
>> 3736 L(test_8bit):
>> 3737 cmpb #8,%d3
>> 3738 jbne L(test_16bit)
>> 3739 addal %d0,%a1
>> 3740 addal %d1,%a1
>> 3741 andb #1,%d2
>> 3742 jbne L(white_8)
>> 3743 moveb #0xff,%a1@
>> 3744 jbra L(console_plot_pixel_exit)
>> 3745 L(white_8):
>> 3746 clrb %a1@
>> 3747 jbra L(console_plot_pixel_exit)
>> 3748
>> 3749 L(test_16bit):
>> 3750 cmpb #16,%d3
>> 3751 jbne L(console_plot_pixel_exit)
>> 3752 addal %d0,%a1
>> 3753 addal %d0,%a1
>> 3754 addal %d1,%a1
>> 3755 andb #1,%d2
>> 3756 jbne L(white_16)
>> 3757 clrw %a1@
>> 3758 jbra L(console_plot_pixel_exit)
>> 3759 L(white_16):
>> 3760 movew #0x0fff,%a1@
>> 3761 jbra L(console_plot_pixel_exit)
>> 3762
>> 3763 L(console_plot_pixel_exit):
>> 3764 func_return console_plot_pixel
>> 3765 #endif /* CONSOLE_DEBUG */
>> 3766
>> 3767
>> 3768 __INITDATA
>> 3769 .align 4
>> 3770
>> 3771 m68k_init_mapped_size:
>> 3772 .long 0
>> 3773
>> 3774 #if defined(CONFIG_ATARI) || defined(CONFIG_AMIGA) || \
>> 3775 defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
>> 3776 L(custom):
>> 3777 L(iobase):
>> 3778 .long 0
>> 3779 #endif
>> 3780
>> 3781 #ifdef CONSOLE_DEBUG
>> 3782 L(console_globals):
>> 3783 .long 0 /* cursor column */
>> 3784 .long 0 /* cursor row */
>> 3785 .long 0 /* max num columns */
>> 3786 .long 0 /* max num rows */
>> 3787 .long 0 /* left edge */
>> 3788 L(console_font):
>> 3789 .long 0 /* pointer to console font (struct font_desc) */
>> 3790 L(console_font_data):
>> 3791 .long 0 /* pointer to console font data */
>> 3792 #endif /* CONSOLE_DEBUG */
>> 3793
>> 3794 #if defined(MMU_PRINT)
>> 3795 L(mmu_print_data):
>> 3796 .long 0 /* valid flag */
>> 3797 .long 0 /* start logical */
>> 3798 .long 0 /* next logical */
>> 3799 .long 0 /* start physical */
>> 3800 .long 0 /* next physical */
>> 3801 #endif /* MMU_PRINT */
>> 3802
>> 3803 L(cputype):
>> 3804 .long 0
>> 3805 L(mmu_cached_pointer_tables):
>> 3806 .long 0
>> 3807 L(mmu_num_pointer_tables):
>> 3808 .long 0
>> 3809 L(phys_kernel_start):
>> 3810 .long 0
>> 3811 L(kernel_end):
>> 3812 .long 0
>> 3813 L(memory_start):
>> 3814 .long 0
>> 3815 L(kernel_pgdir_ptr):
>> 3816 .long 0
>> 3817 L(temp_mmap_mem):
>> 3818 .long 0
>> 3819
>> 3820 #if defined (CONFIG_MVME147)
>> 3821 M147_SCC_CTRL_A = 0xfffe3002
>> 3822 M147_SCC_DATA_A = 0xfffe3003
>> 3823 #endif
>> 3824
>> 3825 #if defined (CONFIG_MVME16x)
>> 3826 M162_SCC_CTRL_A = 0xfff45005
>> 3827 M167_CYCAR = 0xfff450ee
>> 3828 M167_CYIER = 0xfff45011
>> 3829 M167_CYLICR = 0xfff45026
>> 3830 M167_CYTEOIR = 0xfff45085
>> 3831 M167_CYTDR = 0xfff450f8
>> 3832 M167_PCSCCMICR = 0xfff4201d
>> 3833 M167_PCSCCTICR = 0xfff4201e
>> 3834 M167_PCSCCRICR = 0xfff4201f
>> 3835 M167_PCTPIACKR = 0xfff42025
>> 3836 #endif
>> 3837
>> 3838 #if defined (CONFIG_BVME6000)
>> 3839 BVME_SCC_CTRL_A = 0xffb0000b
>> 3840 BVME_SCC_DATA_A = 0xffb0000f
>> 3841 #endif
>> 3842
>> 3843 #if defined(CONFIG_MAC)
>> 3844 L(mac_videobase):
>> 3845 .long 0
>> 3846 L(mac_videodepth):
>> 3847 .long 0
>> 3848 L(mac_dimensions):
>> 3849 .long 0
>> 3850 L(mac_rowbytes):
>> 3851 .long 0
>> 3852 L(mac_sccbase):
>> 3853 .long 0
>> 3854 #endif /* CONFIG_MAC */
>> 3855
>> 3856 #if defined (CONFIG_APOLLO)
>> 3857 LSRB0 = 0x10412
>> 3858 LTHRB0 = 0x10416
>> 3859 LCPUCTRL = 0x10100
>> 3860 #endif
>> 3861
>> 3862 #if defined(CONFIG_HP300)
>> 3863 DCADATA = 0x11
>> 3864 DCALSR = 0x1b
>> 3865 APCIDATA = 0x00
>> 3866 APCILSR = 0x14
>> 3867 L(uartbase):
>> 3868 .long 0
>> 3869 L(uart_scode):
>> 3870 .long -1
>> 3871 #endif
>> 3872
>> 3873 __FINIT
>> 3874 .data
>> 3875 .align 4
>> 3876
>> 3877 availmem:
>> 3878 .long 0
>> 3879 m68k_pgtable_cachemode:
>> 3880 .long 0
>> 3881 m68k_supervisor_cachemode:
>> 3882 .long 0
>> 3883 #if defined(CONFIG_MVME16x)
>> 3884 mvme_bdid:
>> 3885 .long 0,0,0,0,0,0,0,0
>> 3886 #endif
>> 3887 #if defined(CONFIG_Q40)
>> 3888 q40_mem_cptr:
>> 3889 .long 0
>> 3890 L(q40_do_debug):
>> 3891 .long 0
>> 3892 #endif
173 3893
174 /* End of startup code */ !! 3894 #if defined(CONFIG_VIRT)
175 .set at !! 3895 GF_PUT_CHAR = 0x00
>> 3896 L(virt_gf_tty_base):
>> 3897 .long 0
>> 3898 #endif /* CONFIG_VIRT */
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